diff --git a/check_process b/check_process
index e03f6ef..d60ae23 100644
--- a/check_process
+++ b/check_process
@@ -16,21 +16,10 @@
         upgrade=1   from_commit=1cbec051e1171de5a8ed1e850eb4fb3506114da5
         backup_restore=1
         multi_instance=1
-        incorrect_path=0
         port_already_use=1 (6000)
         change_url=1
 ;;; Levels
-    Level 1=auto
-    Level 2=auto
-    Level 3=auto
-    # https://github.com/YunoHost-Apps/gogs_ynh/blob/master/conf/login_source.sql
-    Level 4=1
     Level 5=auto
-    Level 6=auto
-    Level 7=auto
-    Level 8=0
-    Level 9=0
-    Level 10=0
 ;;; Upgrade options
 	; commit=aa075b2051ffad7b0b6fef3a9c767376d5bdbfab
 		name=Before multi_instance and refactoring
diff --git a/manifest.json b/manifest.json
index 0994575..d4d8617 100644
--- a/manifest.json
+++ b/manifest.json
@@ -6,9 +6,9 @@
         "en": "Lightweight git forge",
         "fr": "Forge git légère"
     },
+    "version": "0.12.3~ynh1",
     "url": "http://gogs.io",
     "license": "MIT",
-    "version": "0.12.3~ynh1",
     "maintainer": {
         "name": "Josué Tille",
         "email": "josue@tille.ch"
@@ -23,7 +23,7 @@
         "mysql"
     ],
     "requirements": {
-        "yunohost": ">= 3.8.1"
+        "yunohost": ">= 4.0.0"
     },
     "arguments": {
         "install" : [
diff --git a/scripts/change_url b/scripts/change_url
index fb02f6c..36c742a 100644
--- a/scripts/change_url
+++ b/scripts/change_url
@@ -1,21 +1,24 @@
 #!/bin/bash
 
 #=================================================
-# GENERIC START
+# GENERIC STARTING
+#=================================================
+# IMPORT GENERIC HELPERS
 #=================================================
 
-# IMPORT GENERIC HELPERS
+source _common.sh
 source /usr/share/yunohost/helpers
 
 # Exit if an error occurs during the execution of the script
 ynh_abort_if_errors
 
-# Import common cmd
-source ./_common.sh
-
+#=================================================
 # RETRIEVE ARGUMENTS
+#=================================================
+
 old_domain=$YNH_APP_OLD_DOMAIN
 domain=$YNH_APP_NEW_DOMAIN
+
 path_url=$(ynh_normalize_url_path ${YNH_APP_NEW_PATH:-'/'})
 app=$YNH_APP_INSTANCE_NAME
 
diff --git a/scripts/install b/scripts/install
index b97b0a9..89da145 100644
--- a/scripts/install
+++ b/scripts/install
@@ -3,15 +3,25 @@
 #=================================================
 # GENERIC START
 #=================================================
-
 # IMPORT GENERIC HELPERS
+#=================================================
+
+source _common.sh
 source /usr/share/yunohost/helpers
 
+#=================================================
+# MANAGE SCRIPT FAILURE
+#=================================================
+
+ynh_clean_setup () {
+	true
+}
 # Exit if an error occurs during the execution of the script
 ynh_abort_if_errors
 
-# Load common variables and helpers
-source ./_common.sh
+#=================================================
+# RETRIEVE ARGUMENTS FROM THE MANIFEST
+#=================================================
 
 # Retrieve arguments
 domain=$YNH_APP_ARG_DOMAIN
@@ -19,6 +29,9 @@ path_url=$(ynh_normalize_url_path $YNH_APP_ARG_PATH)
 admin=$YNH_APP_ARG_ADMIN
 is_public=$YNH_APP_ARG_IS_PUBLIC
 
+app=$YNH_APP_INSTANCE_NAME
+
+
 # Check domain/path availability
 ynh_webpath_available $domain $path_url || ynh_die "$domain is not available as domain, please use an other domain."
 ynh_webpath_register $app $domain $path_url
@@ -57,36 +70,115 @@ test getent passwd "$app" &>/dev/null || \
     useradd -d "$DATADIR" --system --user-group "$app" --shell /bin/bash || \
         ynh_die "Unable to create $app system account"
 
+#=================================================
+# CREAT DIRECTORIES
+#=================================================
+
 # create needed directories
-create_dir
+mkdir -p "$final_path/data"
+mkdir -p "$final_path/custom/conf/auth.d"
+mkdir -p "$DATA_PATH/avatars"
+mkdir -p "$DATA_PATH/attachments"
+mkdir -p "/var/log/$app"
+
+#=================================================
+# DOWNLOAD, CHECK AND UNPACK SOURCE
+#=================================================
+ynh_script_progression --message="Setting up source files..." --weight=3
+
+ynh_setup_source --dest_dir=$final_path $architecture
+
+#=================================================
+# MODIFY A CONFIG FILE
+#=================================================
+
+cp ../conf/app.ini "$final_path/custom/conf"
+cp ../conf/ldap.conf "$final_path/custom/conf/auth.d/ldap.conf"
+
+if [ "$path_url" = "/" ]
+then
+    ynh_replace_string --match_string="__URL__" --replace_string="$domain" --target_file="$final_path/custom/conf/app.ini"
+else
+    ynh_replace_string --match_string="__URL__" --replace_string="$domain${path_url%/}" --target_file="$final_path/custom/conf/app.ini"
+fi
+
+ynh_replace_string --match_string="__REPOS_PATH__"  --replace_string="$REPO_PATH" --target_file="$final_path/custom/conf/app.ini"
+ynh_replace_string --match_string="__DB_PASSWORD__" --replace_string="$dbpass"    --target_file="$final_path/custom/conf/app.ini"
+ynh_replace_string --match_string="__DB_USER__"     --replace_string="$dbuser"    --target_file="$final_path/custom/conf/app.ini"
+ynh_replace_string --match_string="__DOMAIN__"      --replace_string="$domain"    --target_file="$final_path/custom/conf/app.ini"
+ynh_replace_string --match_string="__KEY__"         --replace_string="$key"       --target_file="$final_path/custom/conf/app.ini"
+ynh_replace_string --match_string="__DATA_PATH__"   --replace_string="$DATA_PATH" --target_file="$final_path/custom/conf/app.ini"
+ynh_replace_string --match_string="__PORT__"        --replace_string="$port"      --target_file="$final_path/custom/conf/app.ini"
+ynh_replace_string --match_string="__APP__"         --replace_string="$app"       --target_file="$final_path/custom/conf/app.ini"
+
+if [[ "$is_public" = '1' ]]
+then
+    ynh_replace_string --match_string="__PRIVATE_MODE__" --replace_string="false" --target_file="$final_path/custom/conf/app.ini"
+else
+    ynh_replace_string --match_string="__PRIVATE_MODE__" --replace_string="true" --target_file="$final_path/custom/conf/app.ini"
+fi
+
+ynh_replace_string --match_string="__ADMIN__" --replace_string="$admin" --target_file="$final_path/custom/conf/auth.d/ldap.conf"
+
+ynh_store_file_checksum --file="$final_path/custom/conf/app.ini"
+ynh_store_file_checksum --file="$final_path/custom/conf/auth.d/ldap.conf"
+
 
-# Install Gogs
-ynh_setup_source $final_path $architecture
 
-# Configure gogs with app.ini file
-config_gogs
 
 # Configure init script
 ynh_add_systemd_config
 
+#=================================================
+# CONFIGURE NGINX
+#=================================================
 # Modify Nginx configuration file and copy it to Nginx conf directory
-config_nginx
+if [ "$path_url" != "/" ]
+then
+    ynh_replace_string --match_string="^#sub_path_only" --replace_string="" --target_file="../conf/nginx.conf"
+fi
+    ynh_add_nginx_config
 
 #=================================================
 # GENERIC FINALIZATION
 #=================================================
+# SECURE FILES AND DIRECTORIES
+#=================================================
+
+chown -R $app:$app "$final_path"
+chown -R $app:$app "/home/$app"
+chown -R $app:$app "/var/log/$app"
+chmod u=rwX,g=rX,o= "$final_path"
+chmod u=rwX,g=rX,o= "/home/$app"
+chmod u=rwX,g=rX,o= "/var/log/$app"
 
-# Set permissions
-set_permission
 
 # Unprotect root from SSO if public
 set_access_settings
 
-# Add Gogs to YunoHost's monitored services
+#=================================================
+# INTEGRATE SERVICE IN YUNOHOST
+#=================================================
+ynh_script_progression --message="Integrating service in YunoHost..." --weight=1
+
 yunohost service add "$app" --log "/var/log/$app/$app.log"
 
-# Configure logrotate
+#=================================================
+# SETUP LOGROTATE
+#=================================================
+ynh_script_progression --message="Configuring log rotation..." --weight=1
+
 ynh_use_logrotate "/var/log/$app"
 
-# Reload services
+#=================================================
+# START SYSTEMD SERVICE
+#=================================================
+ynh_script_progression --message="Starting a systemd service..." --weight=1
+
 ynh_check_starting "INFO] Listen: http://0.0.0.0:" "/var/log/$app/gogs.log"
+
+#=================================================
+# END OF SCRIPT
+#=================================================
+
+ynh_script_progression --message="Installation of $app completed" --last
diff --git a/scripts/restore b/scripts/restore
index f135ead..4fd1ad7 100644
--- a/scripts/restore
+++ b/scripts/restore
@@ -3,21 +3,37 @@
 #=================================================
 # GENERIC START
 #=================================================
-
 # IMPORT GENERIC HELPERS
+#=================================================
+
+#Keep this path for calling _common.sh inside the execution's context of backup and restore scripts
+source ../settings/scripts/_common.sh
 source /usr/share/yunohost/helpers
 
+#=================================================
+# MANAGE SCRIPT FAILURE
+#=================================================
+
+ynh_clean_setup () {
+	#### Remove this function if there's nothing to clean before calling the remove script.
+	true
+}
 # Exit if an error occurs during the execution of the script
 ynh_abort_if_errors
 
-# Load common variables and helpers
-source ../settings/scripts/_common.sh
+#=================================================
+# LOAD SETTINGS
+#=================================================
+ynh_script_progression --message="Loading installation settings..." --weight=1
+
+app=$YNH_APP_INSTANCE_NAME
+
+domain=$(ynh_app_setting_get --app=$app --key=domain)
+path_url=$(ynh_app_setting_get --app=$app --key=path)
+dbpass=$(ynh_app_setting_get --app=$app --key=mysqlpwd)
+admin=$(ynh_app_setting_get --app=$app --key=adminusername)
+
 
-# Retrieve old app settings
-domain=$(ynh_app_setting_get "$app" domain)
-path_url=$(ynh_app_setting_get "$app" path)
-dbpass=$(ynh_app_setting_get "$app" mysqlpwd)
-admin=$(ynh_app_setting_get "$app" adminusername)
 
 # Check domain/path availability with app helper
 ynh_webpath_available $domain $path_url || ynh_die "$domain is not available as domain, please use an other domain."
diff --git a/scripts/upgrade b/scripts/upgrade
index 483f6b4..03b953b 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -3,17 +3,22 @@
 #=================================================
 # GENERIC START
 #=================================================
-
 # IMPORT GENERIC HELPERS
+#=================================================
+
+source _common.sh
 source /usr/share/yunohost/helpers
 
 # Exit if an error occurs during the execution of the script
 ynh_abort_if_errors
 
-# Load common variables and helpers
-source ./_common.sh
+#=================================================
+# LOAD SETTINGS
+#=================================================
+ynh_script_progression --message="Loading installation settings..." --weight=1
+
+app=$YNH_APP_INSTANCE_NAME
 
-# Retrieve app settings
 domain=$(ynh_app_setting_get "$app" domain)
 path_url=$(ynh_normalize_url_path $(ynh_app_setting_get "$app" path))
 dbpass=$(ynh_app_setting_get "$app" mysqlpwd)