diff --git a/check_process b/check_process
index c71b420..e218cf4 100644
--- a/check_process
+++ b/check_process
@@ -20,10 +20,10 @@
 	Level 1=auto
 	Level 2=auto
 	Level 3=auto
+# Level 4: No multi-users support
 	Level 4=na
-# Level 4: 
-	Level 5=auto
-# Level 5: 
+# Level 5: https://github.com/YunoHost-Apps/transmission_ynh/issues/30
+	Level 5=1
 	Level 6=auto
 	Level 7=auto
 	Level 8=0
diff --git a/manifest.json b/manifest.json
index be21604..9eef4e2 100644
--- a/manifest.json
+++ b/manifest.json
@@ -2,19 +2,20 @@
 	"name": "Transmission",
 	"id": "transmission",
 	"packaging_format": 1,
-	"requirements": {
-		"yunohost": ">= 2.4.0"
-	},
 	"description": {
 		"en": "A Fast, Easy, and Free BitTorrent Client",
 		"fr": "Un client BitTorrent libre et rapide"
 	},
+	"version": "1.0",
 	"url": "https://www.transmissionbt.com/",
 	"license": " GPL-3.0",
 	"maintainer": {
 		"name": "Apps Group",
 		"email": "apps_group@yunohost.org"
 	},
+	"requirements": {
+		"yunohost": ">= 2.7.2"
+	},
 	"multi_instance": false,
 	"services": [
 		"nginx",
diff --git a/scripts/_common.sh b/scripts/_common.sh
index 79cee95..adbff7a 100755
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -7,130 +7,17 @@
 ynh_multimedia_build_main_dir () {
 	wget -qq https://github.com/YunoHost-Apps/yunohost.multimedia/archive/master.zip
 	unzip -qq master.zip
-	sudo ./yunohost.multimedia-master/script/ynh_media_build.sh
+	./yunohost.multimedia-master/script/ynh_media_build.sh
 }
 
 ynh_multimedia_addfolder () {
-	sudo ./yunohost.multimedia-master/script/ynh_media_addfolder.sh --source="$1" --dest="$2"
-}
-
-#=================================================
-#=================================================
-# TESTING
-#=================================================
-#=================================================
-
-ynh_nginx_config () {
-	finalnginxconf="/etc/nginx/conf.d/$domain.d/$app.conf"
-	ynh_backup_if_checksum_is_different "$finalnginxconf" 1
-	sudo cp ../conf/nginx.conf "$finalnginxconf"
-
-	# To avoid a break by set -u, use a void substitution ${var:-}. If the variable is not set, it's simply set with an empty variable.
-	# Substitute in a nginx config file only if the variable is not empty
-	if test -n "${path_url:-}"; then
-		ynh_replace_string "__PATH__" "$path_url" "$finalnginxconf"
-	fi
-	if test -n "${domain:-}"; then
-		ynh_replace_string "__DOMAIN__" "$domain" "$finalnginxconf"
-	fi
-	if test -n "${port:-}"; then
-		ynh_replace_string "__PORT__" "$port" "$finalnginxconf"
-	fi
-	if test -n "${app:-}"; then
-		ynh_replace_string "__NAME__" "$app" "$finalnginxconf"
-	fi
-	if test -n "${final_path:-}"; then
-		ynh_replace_string "__FINALPATH__" "$final_path" "$finalnginxconf"
-	fi
-	ynh_store_file_checksum "$finalnginxconf"
-
-	sudo systemctl reload nginx
-}
-
-ynh_remove_nginx_config () {
-	ynh_secure_remove "/etc/nginx/conf.d/$domain.d/$app.conf"
-	sudo systemctl reload nginx
-}
-
-#=================================================
-#=================================================
-
-#=================================================
-# CHECKING
-#=================================================
-
-CHECK_DOMAINPATH () {	# Vérifie la disponibilité du path et du domaine.
-	if sudo yunohost app --help | grep --quiet url-available
-	then
-		# Check availability of a web path
-		ynh_webpath_available $domain $path_url
-		# Register/book a web path for an app
-		ynh_webpath_register $app $domain $path_url
-	else
-		# Use the legacy command
-		sudo yunohost app checkurl $domain$path_url -a $app
-	fi
-}
-
-#=================================================
-# DISPLAYING
-#=================================================
-
-# NO_PRINT () {	# Supprime l'affichage dans stdout pour la commande en argument.
-# 	set +x
-# 	$@
-# 	set -x
-# }
-
-WARNING () {	# Écrit sur le canal d'erreur pour passer en warning.
-	$@ >&2
-}
-
-# SUPPRESS_WARNING () {	# Force l'écriture sur la sortie standard
-# 	$@ 2>&1
-# }
-
-# QUIET () {	# Redirige la sortie standard dans /dev/null
-# 	$@ > /dev/null
-# }
-
-ALL_QUIET () {	# Redirige la sortie standard et d'erreur dans /dev/null
-	$@ > /dev/null 2>&1
+	./yunohost.multimedia-master/script/ynh_media_addfolder.sh --source="$1" --dest="$2"
 }
 
 #=================================================
 # BACKUP
 #=================================================
 
-BACKUP_FAIL_UPGRADE () {
-	WARNING echo "Upgrade failed."
-	app_bck=${app//_/-}	# Replace all '_' by '-'
-	if sudo yunohost backup list | grep -q $app_bck-pre-upgrade$backup_number; then	# Vérifie l'existence de l'archive avant de supprimer l'application et de restaurer
-		sudo yunohost app remove $app	# Supprime l'application avant de la restaurer.
-		sudo yunohost backup restore --ignore-hooks $app_bck-pre-upgrade$backup_number --apps $app --force	# Restore the backup if upgrade failed
-		ynh_die "The app was restored to the way it was before the failed upgrade."
-	fi
-}
-
-BACKUP_BEFORE_UPGRADE () {	# Backup the current version of the app, restore it if the upgrade fails
-	backup_number=1
-	old_backup_number=2
-	app_bck=${app//_/-}	# Replace all '_' by '-'
-	if sudo yunohost backup list | grep -q $app_bck-pre-upgrade1; then	# Vérifie l'existence d'une archive déjà numéroté à 1.
-		backup_number=2	# Et passe le numéro de l'archive à 2
-		old_backup_number=1
-	fi
-
-	sudo yunohost backup create --ignore-hooks --apps $app --name $app_bck-pre-upgrade$backup_number	# Créer un backup différent de celui existant.
-	if [ "$?" -eq 0 ]; then	# Si le backup est un succès, supprime l'archive précédente.
-		if sudo yunohost backup list | grep -q $app_bck-pre-upgrade$old_backup_number; then	# Vérifie l'existence de l'ancienne archive avant de la supprimer, pour éviter une erreur.
-			QUIET sudo yunohost backup delete $app_bck-pre-upgrade$old_backup_number
-		fi
-	else	# Si le backup a échoué
-		ynh_die "Backup failed, the upgrade process was aborted."
-	fi
-}
-
 HUMAN_SIZE () {	# Transforme une taille en Ko en une taille lisible pour un humain
 	human=$(numfmt --to=iec --from-unit=1K $1)
 	echo $human
@@ -138,236 +25,13 @@ HUMAN_SIZE () {	# Transforme une taille en Ko en une taille lisible pour un huma
 
 CHECK_SIZE () {	# Vérifie avant chaque backup que l'espace est suffisant
 	file_to_analyse=$1
-	backup_size=$(sudo du --summarize "$file_to_analyse" | cut -f1)
-	free_space=$(sudo df --output=avail "/home/yunohost.backup" | sed 1d)
+	backup_size=$(du --summarize "$file_to_analyse" | cut -f1)
+	free_space=$(df --output=avail "/home/yunohost.backup" | sed 1d)
 
 	if [ $free_space -le $backup_size ]
 	then
-		WARNING echo "Espace insuffisant pour sauvegarder $file_to_analyse."
-		WARNING echo "Espace disponible: $(HUMAN_SIZE $free_space)"
+		echo "Espace insuffisant pour sauvegarder $file_to_analyse." >&2
+		echo "Espace disponible: $(HUMAN_SIZE $free_space)" >&2
 		ynh_die "Espace nécessaire: $(HUMAN_SIZE $backup_size)"
 	fi
 }
-
-# Ce helper est temporaire et sert de remplacement à la véritable fonction ynh_restore_file. Le temps qu'elle arrive...
-ynh_restore_file () {
-	if [ -f "$1" ]; then
-		ynh_die "There is already a file at this path: $1"
-	fi
-	sudo cp -a "${YNH_APP_BACKUP_DIR}$1" "$1"
-}
-
-#=================================================
-#=================================================
-# FUTUR YNH HELPERS
-#=================================================
-# Importer ce fichier de fonction avant celui des helpers officiel
-# Ainsi, les officiels prendront le pas sur ceux-ci le cas échéant
-#=================================================
-
-# Normalize the url path syntax
-# Handle the slash at the beginning of path and its absence at ending
-# Return a normalized url path
-#
-# example: url_path=$(ynh_normalize_url_path $url_path)
-#          ynh_normalize_url_path example -> /example
-#          ynh_normalize_url_path /example -> /example
-#          ynh_normalize_url_path /example/ -> /example
-#          ynh_normalize_url_path / -> /
-#
-# usage: ynh_normalize_url_path path_to_normalize
-# | arg: url_path_to_normalize - URL path to normalize before using it
-ynh_normalize_url_path () {
-	path_url=$1
-	test -n "$path_url" || ynh_die "ynh_normalize_url_path expect a URL path as first argument and received nothing."
-	if [ "${path_url:0:1}" != "/" ]; then    # If the first character is not a /
-		path_url="/$path_url"    # Add / at begin of path variable
-	fi
-	if [ "${path_url:${#path_url}-1}" == "/" ] && [ ${#path_url} -gt 1 ]; then    # If the last character is a / and that not the only character.
-		path_url="${path_url:0:${#path_url}-1}"	# Delete the last character
-	fi
-	echo $path_url
-}
-
-# Manage a fail of the script
-#
-# Print a warning to inform that the script was failed
-# Execute the ynh_clean_setup function if used in the app script
-#
-# usage of ynh_clean_setup function
-# This function provide a way to clean some residual of installation that not managed by remove script.
-# To use it, simply add in your script:
-# ynh_clean_setup () {
-#        instructions...
-# }
-# This function is optionnal.
-#
-# Usage: ynh_exit_properly is used only by the helper ynh_abort_if_errors.
-# You must not use it directly.
-ynh_exit_properly () {
-	exit_code=$?
-	if [ "$exit_code" -eq 0 ]; then
-			exit 0	# Exit without error if the script ended correctly
-	fi
-
-	trap '' EXIT	# Ignore new exit signals
-	set +eu	# Do not exit anymore if a command fail or if a variable is empty
-
-	echo -e "!!\n  $app's script has encountered an error. Its execution was cancelled.\n!!" >&2
-
-	if type -t ynh_clean_setup > /dev/null; then	# Check if the function exist in the app script.
-		ynh_clean_setup	# Call the function to do specific cleaning for the app.
-	fi
-
-	ynh_die	# Exit with error status
-}
-
-# Exit if an error occurs during the execution of the script.
-#
-# Stop immediatly the execution if an error occured or if a empty variable is used.
-# The execution of the script is derivate to ynh_exit_properly function before exit.
-#
-# Usage: ynh_abort_if_errors
-ynh_abort_if_errors () {
-	set -eu	# Exit if a command fail, and if a variable is used unset.
-	trap ynh_exit_properly EXIT	# Capturing exit signals on shell script
-}
-
-# Find a free port and return it
-#
-# example: port=$(ynh_find_port 8080)
-#
-# usage: ynh_find_port begin_port
-# | arg: begin_port - port to start to search
-ynh_find_port () {
-	port=$1
-	test -n "$port" || ynh_die "The argument of ynh_find_port must be a valid port."
-	while netcat -z 127.0.0.1 $port       # Check if the port is free
-	do
-		port=$((port+1))	# Else, pass to next port
-	done
-	echo $port
-}
-
-# Delete a system user
-#
-# usage: ynh_system_user_delete user_name
-# | arg: user_name - Name of the system user that will be create
-ynh_system_user_delete () {
-    if ynh_system_user_exists "$1"	# Check if the user exists on the system
-    then
-		echo "Remove the user $1" >&2
-		sudo userdel $1
-	else
-		echo "The user $1 was not found" >&2
-    fi
-}
-
-# Substitute/replace a string by another in a file
-#
-# usage: ynh_replace_string match_string replace_string target_file
-# | arg: match_string - String to be searched and replaced in the file
-# | arg: replace_string - String that will replace matches
-# | arg: target_file - File in which the string will be replaced.
-ynh_replace_string () {
-	delimit=@
-	match_string=${1//${delimit}/"\\${delimit}"}	# Escape the delimiter if it's in the string.
-	replace_string=${2//${delimit}/"\\${delimit}"}
-	workfile=$3
-
-	sudo sed --in-place "s${delimit}${match_string}${delimit}${replace_string}${delimit}g" "$workfile"
-}
-
-# Remove a file or a directory securely
-#
-# usage: ynh_secure_remove path_to_remove
-# | arg: path_to_remove - File or directory to remove
-ynh_secure_remove () {
-	path_to_remove=$1
-	forbidden_path=" \
-	/var/www \
-	/home/yunohost.app"
-
-	if [[ "$forbidden_path" =~ "$path_to_remove" \
-		# Match all paths or subpaths in $forbidden_path
-		|| "$path_to_remove" =~ ^/[[:alnum:]]+$ \
-		# Match all first level paths from / (Like /var, /root, etc...)
-		|| "${path_to_remove:${#path_to_remove}-1}" = "/" ]]
-		# Match if the path finishes by /. Because it seems there is an empty variable
-	then
-		echo "Avoid deleting $path_to_remove." >&2
-	else
-		if [ -e "$path_to_remove" ]
-		then
-			sudo rm -R "$path_to_remove"
-		else
-			echo "$path_to_remove wasn't deleted because it doesn't exist." >&2
-		fi
-	fi
-}
-
-# Check availability of a web path
-#
-# example: ynh_webpath_available some.domain.tld /coffee
-#
-# usage: ynh_webpath_available domain path
-# | arg: domain - the domain/host of the url
-# | arg: path - the web path to check the availability of
-ynh_webpath_available () {
-	local domain=$1
-	local path=$2
-	sudo yunohost domain url-available $domain $path
-}
-
-# Register/book a web path for an app
-#
-# example: ynh_webpath_register wordpress some.domain.tld /coffee
-#
-# usage: ynh_webpath_register app domain path
-# | arg: app - the app for which the domain should be registered
-# | arg: domain - the domain/host of the web path
-# | arg: path - the web path to be registered
-ynh_webpath_register () {
-	local app=$1
-	local domain=$2
-	local path=$3
-	sudo yunohost app register-url $app $domain $path
-}
-
-# Calculate and store a file checksum into the app settings
-#
-# $app should be defined when calling this helper
-#
-# usage: ynh_store_file_checksum file
-# | arg: file - The file on which the checksum will performed, then stored.
-ynh_store_file_checksum () {
-	local checksum_setting_name=checksum_${1//[\/ ]/_}	# Replace all '/' and ' ' by '_'
-	ynh_app_setting_set $app $checksum_setting_name $(sudo md5sum "$1" | cut -d' ' -f1)
-}
-
-# Verify the checksum and backup the file if it's different
-# This helper is primarily meant to allow to easily backup personalised/manually 
-# modified config files.
-#
-# $app should be defined when calling this helper
-#
-# usage: ynh_backup_if_checksum_is_different file
-# | arg: file - The file on which the checksum test will be perfomed.
-#
-# | ret: Return the name a the backup file, or nothing
-ynh_backup_if_checksum_is_different () {
-	local file=$1
-	local checksum_setting_name=checksum_${file//[\/ ]/_}	# Replace all '/' and ' ' by '_'
-	local checksum_value=$(ynh_app_setting_get $app $checksum_setting_name)
-	if [ -n "$checksum_value" ]
-	then	# Proceed only if a value was stored into the app settings
-		if ! echo "$checksum_value $file" | sudo md5sum -c --status
-		then	# If the checksum is now different
-			backup_file="/home/yunohost.conf/backup/$file.backup.$(date '+%Y%m%d.%H%M%S')"
-			sudo mkdir -p "$(dirname "$backup_file")"
-			sudo cp -a "$file" "$backup_file"	# Backup the current file
-			echo "File $file has been manually modified since the installation or last upgrade. So it has been duplicated in $backup_file" >&2
-			echo "$backup_file"	# Return the name of the backup file
-		fi
-	fi
-}
diff --git a/scripts/backup b/scripts/backup
index 8662c9d..6fba36d 100644
--- a/scripts/backup
+++ b/scripts/backup
@@ -14,9 +14,9 @@ set -eu
 #=================================================
 
 if [ ! -e _common.sh ]; then
-	# Rapatrie le fichier de fonctions si il n'est pas dans le dossier courant
-	sudo cp ../settings/scripts/_common.sh ./_common.sh
-	sudo chmod a+rx _common.sh
+	# Get the _common.sh file if it's not in the current directory
+	cp ../settings/scripts/_common.sh ./_common.sh
+	chmod a+rx _common.sh
 fi
 source _common.sh
 source /usr/share/yunohost/helpers
@@ -35,7 +35,7 @@ domain=$(ynh_app_setting_get $app domain)
 # BACKUP OF THE NGINX CONFIGURATION
 #=================================================
 
-ynh_backup "/etc/nginx/conf.d/$domain.d/$app.conf" "${YNH_APP_BACKUP_DIR}/etc/nginx/conf.d/$domain.d/$app.conf"
+ynh_backup "/etc/nginx/conf.d/$domain.d/$app.conf"
 
 #=================================================
 # SPECIFIC BACKUP
@@ -43,23 +43,22 @@ ynh_backup "/etc/nginx/conf.d/$domain.d/$app.conf" "${YNH_APP_BACKUP_DIR}/etc/ng
 # BACKUP TRANSMISSION CONFIGURATION
 #=================================================
 
-ynh_backup "/etc/transmission-daemon/settings.json" "${YNH_APP_BACKUP_DIR}/etc/transmission-daemon/settings.json"
+ynh_backup "/etc/transmission-daemon/settings.json"
 
 #=================================================
 # BACKUP DATA
 #=================================================
 
-CHECK_SIZE "/usr/share/transmission"
-ynh_backup "/usr/share/transmission" "${YNH_APP_BACKUP_DIR}/usr/share/transmission"
+ynh_backup "/usr/share/transmission"
 
-CHECK_SIZE "/var/lib/transmission-daemon"
-ynh_backup "/var/lib/transmission-daemon" "${YNH_APP_BACKUP_DIR}/var/lib/transmission-daemon"
+ynh_backup "/var/lib/transmission-daemon"
 
 backup_core_only=$(ynh_app_setting_get $app backup_core_only)
-if [ -z $backup_core_only ]	# Si backup_core_only a une valeur dans le fichier settings.yml, ne sauvegarde pas le dossier data
+# If backup_core_only have a value in settings.yml, do not backup the data directory
+if [ -z $backup_core_only ]
 then
 	CHECK_SIZE "/home/yunohost.transmission"
-	ynh_backup "/home/yunohost.transmission" "${YNH_APP_BACKUP_DIR}/home/yunohost.transmission"
+	ynh_backup "/home/yunohost.transmission"
 else
 	echo "Data dir will not saved, because backup_core_only is set." >&2
 fi
diff --git a/scripts/install b/scripts/install
index 960253d..3cfff11 100644
--- a/scripts/install
+++ b/scripts/install
@@ -13,7 +13,8 @@ source /usr/share/yunohost/helpers
 # MANAGE FAILURE OF THE SCRIPT
 #=================================================
 
-ynh_abort_if_errors	# Active trap pour arrêter le script si une erreur est détectée.
+# Exit if an error occurs during the execution of the script
+ynh_abort_if_errors
 
 #=================================================
 # RETRIEVE ARGUMENTS FROM THE MANIFEST
@@ -28,8 +29,13 @@ app=$YNH_APP_INSTANCE_NAME
 # CHECK IF THE APP CAN BE INSTALLED WITH THIS ARGS
 #=================================================
 
-path_url=$(ynh_normalize_url_path $path_url)	# Vérifie et corrige la syntaxe du path.
-CHECK_DOMAINPATH	# Vérifie la disponibilité du path et du domaine.
+# Normalize the url path syntax
+path_url=$(ynh_normalize_url_path $path_url)
+
+# Check web path availability
+ynh_webpath_available $domain $path_url
+# Register (book) web path
+ynh_webpath_register $app $domain $path_url
 
 #=================================================
 # STORE SETTINGS FROM MANIFEST
@@ -44,14 +50,16 @@ ynh_app_setting_set $app path $path_url
 # FIND AND OPEN PORTS
 #=================================================
 
-port=$(ynh_find_port 9091)	# Cherche un port libre.
-# Ouvre le port dans le firewall
-ALL_QUIET sudo yunohost firewall allow --no-upnp TCP $port
+# Find a free port
+port=$(ynh_find_port 9091)
+# Open this port
+yunohost firewall allow --no-upnp TCP $port >/dev/null 2>&1
 ynh_app_setting_set $app port $port
 
-peer_port=$(ynh_find_port 51413)	# Cherche un port libre.
-# Ouvre le port dans le firewall
-ALL_QUIET sudo yunohost firewall allow TCP $peer_port
+# Find a free port
+peer_port=$(ynh_find_port 51413)
+# Open this port
+yunohost firewall allow TCP $peer_port >/dev/null 2>&1
 ynh_app_setting_set $app peer_port $peer_port
 
 #=================================================
@@ -67,7 +75,7 @@ ynh_package_install transmission-daemon
 # Add a "/" at the end of path_url for next commands
 # To avoid a double / in the nginx config file.
 [ "$path_url" = "/" ] || path_url=${path_url}/
-ynh_nginx_config
+ynh_add_nginx_config
 
 #=================================================
 # SPECIFIC SETUP
@@ -75,23 +83,23 @@ ynh_nginx_config
 # CREATE DIRECTORIES
 #=================================================
 
-sudo mkdir -p /home/yunohost.transmission/{progress,completed,watched}
+mkdir -p /home/yunohost.transmission/{progress,completed,watched}
 
 #=================================================
 # SECURING FILES AND DIRECTORIES
 #=================================================
 
-sudo chown -R debian-transmission:www-data /home/yunohost.transmission/
-sudo chown -R debian-transmission: /home/yunohost.transmission/{progress,watched}
-sudo chmod -R 764 /home/yunohost.transmission
-sudo chmod -R 777 /home/yunohost.transmission/watched
+chown -R debian-transmission:www-data /home/yunohost.transmission/
+chown -R debian-transmission: /home/yunohost.transmission/{progress,watched}
+chmod -R 764 /home/yunohost.transmission
+chmod -R 777 /home/yunohost.transmission/watched
 
 #=================================================
 # CONFIGURE TRANSMISSION
 #=================================================
 
 # Transmission has to be stopped before modifying its config
-sudo systemctl stop transmission-daemon
+systemctl stop transmission-daemon
 
 # Create a RPC password
 rpcpassword=$(ynh_string_random)
@@ -101,7 +109,7 @@ ynh_replace_string "__RPC_PASSWORD_TO_CHANGE__" "$rpcpassword" ../conf/settings.
 ynh_replace_string "__PATH__" "$path_url" ../conf/settings.json
 ynh_replace_string "__PEER_PORT__" "$peer_port" ../conf/settings.json
 ynh_replace_string "__PORT__" "$port" ../conf/settings.json
-sudo cp ../conf/settings.json /etc/transmission-daemon/settings.json
+cp ../conf/settings.json /etc/transmission-daemon/settings.json
 
 #=================================================
 # STORE THE CHECKSUM OF THE CONFIG FILE
@@ -125,8 +133,8 @@ ynh_multimedia_addfolder "/home/yunohost.transmission/watched" "share/Torrent to
 # PATCH SOURCE TO ADD A DOWNLOAD BUTTON
 #=================================================
 
-sudo cp ../sources/extra_files/app/toolbar-downloads.png /usr/share/transmission/web/style/transmission/images/toolbar-downloads.png
-sudo bash -c 'cat ../sources/extra_files/app/ynh_common.css >> /usr/share/transmission/web/style/transmission/common.css'
+cp ../sources/extra_files/app/toolbar-downloads.png /usr/share/transmission/web/style/transmission/images/toolbar-downloads.png
+cat ../sources/extra_files/app/ynh_common.css >> /usr/share/transmission/web/style/transmission/common.css
 ynh_replace_string "<div id=\"toolbar-inspector\" title=\"Toggle Inspector\"></div>" "<div id=\"toolbar-inspector\" title=\"Toggle Inspector\"></div><div id=\"toolbar-separator\"></div><a href=\"../../downloads/\" id=\"toolbar-downloads\" title=\"Downloads\" target=\"_blank\"></a>" /usr/share/transmission/web/index.html
 
 #=================================================
@@ -135,16 +143,16 @@ ynh_replace_string "<div id=\"toolbar-inspector\" title=\"Toggle Inspector\"></d
 # ENABLE SERVICE IN ADMIN PANEL
 #=================================================
 
-sudo yunohost service add transmission-daemon --log "/var/log/syslog"
+yunohost service add transmission-daemon --log "/var/log/syslog"
 
 #=================================================
 # START TRANSMISSION
 #=================================================
 
-sudo systemctl start transmission-daemon
+systemctl start transmission-daemon
 
 #=================================================
 # RELOAD NGINX
 #=================================================
 
-sudo systemctl reload nginx
+systemctl reload nginx
diff --git a/scripts/remove b/scripts/remove
index 7d8e574..f89c7f8 100644
--- a/scripts/remove
+++ b/scripts/remove
@@ -32,24 +32,34 @@ ynh_package_autoremove transmission-common
 # DISABLE SERVICE IN ADMIN PANEL
 #=================================================
 
-if sudo yunohost service status | grep -q transmission-daemon	# Test l'existence du service dans Yunohost
+if yunohost service status | grep -q transmission-daemon
 then
 	echo "Remove transmission-daemon service"
-	sudo yunohost service remove transmission-daemon
+	yunohost service remove transmission-daemon
 fi
 
 #=================================================
 # CLOSE THE PORTS
 #=================================================
 
-ALL_QUIET sudo yunohost firewall disallow TCP $port
-ALL_QUIET sudo yunohost firewall disallow TCP $peer_port
+if yunohost firewall list | grep -q "\- $port$"
+then
+	echo "Close port $port"
+	yunohost firewall disallow TCP $port 2>&1
+fi
+
+if yunohost firewall list | grep -q "\- $peer_port$"
+then
+	echo "Close port $peer_port"
+	yunohost firewall disallow TCP $peer_port 2>&1
+fi
 
 #=================================================
 # REMOVE THE NGINX CONFIGURATION
 #=================================================
 
-ynh_remove_nginx_config	# Suppression de la configuration nginx
+# Remove the dedicated nginx config
+ynh_remove_nginx_config
 
 #=================================================
 # SPECIFIC REMOVE
@@ -58,14 +68,15 @@ ynh_remove_nginx_config	# Suppression de la configuration nginx
 #=================================================
 
 backup_core_only=$(ynh_app_setting_get $app backup_core_only)
-if [ -z $backup_core_only ]	# Si backup_core_only a une valeur dans le fichier settings.yml, ne supprime pas le dossier data
+# If backup_core_only have a value in settings.yml, do not remove the data directory
+if [ -z $backup_core_only ]
 then
 	ynh_secure_remove /home/yunohost.transmission
 fi
 
 # And remove the link in yunohost.multimedia
-sudo rm "/home/yunohost.multimedia/share/Torrents"
-sudo rm "/home/yunohost.multimedia/share/Torrent to download"
+rm "/home/yunohost.multimedia/share/Torrents"
+rm "/home/yunohost.multimedia/share/Torrent to download"
 
 # Web interface
 ynh_secure_remove /usr/share/transmission
diff --git a/scripts/restore b/scripts/restore
index 50593a8..bb6e1ce 100644
--- a/scripts/restore
+++ b/scripts/restore
@@ -14,9 +14,9 @@ set -eu
 #=================================================
 
 if [ ! -e _common.sh ]; then
-	# Rapatrie le fichier de fonctions si il n'est pas dans le dossier courant
-	sudo cp ../settings/scripts/_common.sh ./_common.sh
-	sudo chmod a+rx _common.sh
+	# Get the _common.sh file if it's not in the current directory
+	cp ../settings/scripts/_common.sh ./_common.sh
+	chmod a+rx _common.sh
 fi
 source _common.sh
 source /usr/share/yunohost/helpers
@@ -36,7 +36,7 @@ peer_port=$(ynh_app_setting_get $app peer_port)
 # CHECK IF THE APP CAN BE RESTORED
 #=================================================
 
-sudo yunohost app checkurl "${domain}${path_url}" -a "$app" \
+ynh_webpath_available $domain $path_url \
 	|| ynh_die "Path not available: ${domain}${path_url}"
 
 #=================================================
@@ -51,8 +51,8 @@ ynh_restore_file "/etc/nginx/conf.d/$domain.d/$app.conf"
 # OPEN PORTS
 #=================================================
 
-ALL_QUIET sudo yunohost firewall allow --no-upnp TCP $port
-ALL_QUIET sudo yunohost firewall allow TCP $peer_port
+yunohost firewall allow --no-upnp TCP $port >/dev/null 2>&1
+yunohost firewall allow TCP $peer_port >/dev/null 2>&1
 
 #=================================================
 # SPECIFIC RESTORE
@@ -67,7 +67,7 @@ ynh_package_install transmission-daemon
 #=================================================
 
 # Transmission has to be stopped before modifying its config
-sudo systemctl stop transmission-daemon
+systemctl stop transmission-daemon
 
 ynh_secure_remove /etc/transmission-daemon/settings.json
 ynh_restore_file /etc/transmission-daemon/settings.json
@@ -82,17 +82,20 @@ ynh_restore_file /usr/share/transmission
 ynh_secure_remove /var/lib/transmission-daemon
 ynh_restore_file /var/lib/transmission-daemon
 
-if [ -d "${YNH_APP_BACKUP_DIR}/home/yunohost.transmission" ]	# Le dossier data est restauré seulement si il existe. Si le backup a été fait avec l'option backup_core_only, ce dossier n'a pas été sauvegardé.
+# The data directory is restored only if it's in the backup.
+# If the backup have made with backup_core_only option, this directory didn't saved.
+if [ -d "${YNH_APP_BACKUP_DIR}/home/yunohost.transmission" ]
 then
 	ynh_restore_file "/home/yunohost.transmission"
 else
-	sudo mkdir -p /home/yunohost.transmission/{progress,completed,watched}
-	sudo chown -R debian-transmission:www-data /home/yunohost.transmission/
-	sudo chown -R debian-transmission: /home/yunohost.transmission/{progress,watched}
-	sudo chmod -R 640 /home/yunohost.transmission
-	sudo chmod -R 777 /home/yunohost.transmission/watched
+	mkdir -p /home/yunohost.transmission/{progress,completed,watched}
+	chown -R debian-transmission:www-data /home/yunohost.transmission/
+	chown -R debian-transmission: /home/yunohost.transmission/{progress,watched}
+	chmod -R 640 /home/yunohost.transmission
+	chmod -R 777 /home/yunohost.transmission/watched
 fi
-ynh_app_setting_delete $app backup_core_only # Retire l'option backup_core_only du fichier settings.yml le cas échéant
+# Remove the backup_core_only option from the settings.yml
+ynh_app_setting_delete $app backup_core_only
 
 #=================================================
 # YUNOHOST MULTIMEDIA INTEGRATION
@@ -110,16 +113,16 @@ ynh_multimedia_addfolder "/home/yunohost.transmission/watched" "share/Torrent to
 # ENABLE SERVICE IN ADMIN PANEL
 #=================================================
 
-sudo yunohost service add transmission-daemon --log "/var/log/syslog"
+yunohost service add transmission-daemon --log "/var/log/syslog"
 
 #=================================================
 # START TRANSMISSION
 #=================================================
 
-sudo systemctl start transmission-daemon
+systemctl start transmission-daemon
 
 #=================================================
 # RELOAD NGINX
 #=================================================
 
-sudo systemctl reload nginx
+systemctl reload nginx
diff --git a/scripts/upgrade b/scripts/upgrade
index 4f6bd16..45f99fa 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -37,18 +37,20 @@ fi
 # BACKUP BEFORE UPGRADE THEN ACTIVE TRAP
 #=================================================
 
-ynh_app_setting_set $app backup_core_only 1 # Indique au backup/restore de ne pas sauvegarder le dossier de data.
-BACKUP_BEFORE_UPGRADE	# Backup the current version of the app
+# Inform the backup/restore process that it should not save the data directory
+ynh_app_setting_set $app backup_core_only 1
+ynh_backup_before_upgrade	# Backup the current version of the app
 ynh_clean_setup () {
-	BACKUP_FAIL_UPGRADE	# restore it if the upgrade fails
+	ynh_restore_upgradebackup	# restore it if the upgrade fails
 }
-ynh_abort_if_errors	# Active trap pour arrêter le script si une erreur est détectée.
+ynh_abort_if_errors	# Exit if an error occurs during the execution of the script
 
 #=================================================
 # CHECK THE PATH
 #=================================================
 
-path_url=$(ynh_normalize_url_path $path_url)	# Vérifie et corrige la syntaxe du path.
+# Normalize the URL path syntax
+path_url=$(ynh_normalize_url_path $path_url)
 
 #=================================================
 # STANDARD UPGRADE STEPS
@@ -59,7 +61,7 @@ path_url=$(ynh_normalize_url_path $path_url)	# Vérifie et corrige la syntaxe du
 # Add a "/" at the end of path_url for next commands
 # To avoid a double / in the nginx config file.
 [ "$path_url" = "/" ] || path_url=${path_url}/
-ynh_nginx_config
+ynh_add_nginx_config
 
 #=================================================
 # SPECIFIC UPGRADE
@@ -67,25 +69,25 @@ ynh_nginx_config
 # CREATE DIRECTORIES
 #=================================================
 
-sudo mkdir -p /home/yunohost.transmission/{progress,completed,watched}
+mkdir -p /home/yunohost.transmission/{progress,completed,watched}
 
 #=================================================
 # SECURING FILES AND DIRECTORIES
 #=================================================
 
-sudo chown -R debian-transmission:www-data /home/yunohost.transmission/
-sudo chown -R debian-transmission: /home/yunohost.transmission/{progress,watched}
-sudo chmod -R 640 /home/yunohost.transmission
-sudo chmod -R 777 /home/yunohost.transmission/watched
+chown -R debian-transmission:www-data /home/yunohost.transmission/
+chown -R debian-transmission: /home/yunohost.transmission/{progress,watched}
+chmod -R 764 /home/yunohost.transmission
+chmod -R 777 /home/yunohost.transmission/watched
 
 #=================================================
 # CONFIGURE TRANSMISSION
 #=================================================
 
 # Transmission has to be stopped before modifying its config
-sudo systemctl stop transmission-daemon
+systemctl stop transmission-daemon
 
-# Créé un backup du fichier de config si il a été modifié.
+# Verify the checksum and backup the file if it's different
 ynh_backup_if_checksum_is_different /etc/transmission-daemon/settings.json
 
 # Create a RPC password
@@ -96,12 +98,13 @@ ynh_replace_string "__RPC_PASSWORD_TO_CHANGE__" "$rpcpassword" ../conf/settings.
 ynh_replace_string "__PATH__" "$path_url" ../conf/settings.json
 ynh_replace_string "__PEER_PORT__" "$peer_port" ../conf/settings.json
 ynh_replace_string "__PORT__" "$port" ../conf/settings.json
-sudo cp ../conf/settings.json /etc/transmission-daemon/settings.json
+cp ../conf/settings.json /etc/transmission-daemon/settings.json
 
 #=================================================
 # STORE THE CHECKSUM OF THE CONFIG FILE
 #=================================================
 
+# Recalculate and store the config file checksum into the app settings
 ynh_store_file_checksum /etc/transmission-daemon/settings.json
 
 #=================================================
@@ -120,10 +123,10 @@ ynh_multimedia_addfolder "/home/yunohost.transmission/watched" "share/Torrent to
 # PATCH SOURCE TO ADD A DOWNLOAD BUTTON
 #=================================================
 
-sudo cp ../sources/extra_files/app/toolbar-downloads.png /usr/share/transmission/web/style/transmission/images/toolbar-downloads.png
+cp ../sources/extra_files/app/toolbar-downloads.png /usr/share/transmission/web/style/transmission/images/toolbar-downloads.png
 if ! grep --quiet "Inserted by Yunohost install script" /usr/share/transmission/web/style/transmission/common.css
 then
-	sudo bash -c 'cat ../sources/extra_files/app/ynh_common.css >> /usr/share/transmission/web/style/transmission/common.css'
+    cat ../sources/extra_files/app/ynh_common.css >> /usr/share/transmission/web/style/transmission/common.css
 fi
 ynh_replace_string "<div id=\"toolbar-inspector\" title=\"Toggle Inspector\"></div>$" "<div id=\"toolbar-inspector\" title=\"Toggle Inspector\"></div><div id=\"toolbar-separator\"></div><a href=\"../../downloads/\" id=\"toolbar-downloads\" title=\"Downloads\" target=\"_blank\"></a>" /usr/share/transmission/web/index.html
 
@@ -131,13 +134,13 @@ ynh_replace_string "<div id=\"toolbar-inspector\" title=\"Toggle Inspector\"></d
 # START TRANSMISSION
 #=================================================
 
-sudo systemctl start transmission-daemon
+systemctl start transmission-daemon
 
 #=================================================
 # RELOAD NGINX
 #=================================================
 
-sudo systemctl reload nginx
+systemctl reload nginx
 
 #=================================================
 # REMOVE BACKUP_CORE_ONLY