diff --git a/README.md b/README.md
index 562bc0a..c209948 100644
--- a/README.md
+++ b/README.md
@@ -5,5 +5,3 @@ It install the Debian package and configures it with given settings.
 #### Setup
 
 - [Add the admin](http://wiki.mumble.info/wiki/Murmurguide#Connecting_to_Murmur_Server)
-
-email me at matlink@matlink.fr if you need something or to give me feedback about this app.
diff --git a/check_process b/check_process
index 8931f14..bb4a25d 100644
--- a/check_process
+++ b/check_process
@@ -23,3 +23,15 @@
 		fail_download_source=0
 		port_already_use=1
 		final_path_already_use=0
+;;; Levels
+	Level 1=auto
+	Level 2=auto
+	Level 3=auto
+	# https://github.com/YunoHost-Apps/mumbleserver_ynh/issues/11
+	Level 4=1
+	Level 5=auto
+	Level 6=auto
+	Level 7=auto
+	Level 8=0
+	Level 9=0
+	Level 10=0
diff --git a/manifest.json b/manifest.json
index 99ffb32..fd6a149 100644
--- a/manifest.json
+++ b/manifest.json
@@ -6,11 +6,14 @@
         "en": "Mumble is a libre, low-latency, high quality voice chat software primarily intended for use while gaming.",
         "fr": "Mumble est un logiciel libre de voix sur IP (VoIP), son principal usage étant la communication pendant les parties de jeux en réseau."
     },
-    "url": "http://mumble.info",
+    "url": "https://mumble.info",
     "license": "free",
     "maintainer": {
-        "name": "Matlink",
-        "email": "matlink@matlink.fr"
+        "name": "Moul",
+        "email": "moul@moul.re"
+    },
+    "requirements": {
+        "yunohost": ">> 2.4.0"
     },
     "multi_instance": false,
     "services": [
diff --git a/scripts/install b/scripts/install
index aae19da..4b67ab7 100644
--- a/scripts/install
+++ b/scripts/install
@@ -1,59 +1,64 @@
 #!/bin/bash
-
 #debug commands
 #exec > >(tee /tmp/mumble-install.log)
 #exec 2>&1
 
-app=mumbleserver
+# Exit on command errors and treat unset variables as an error
+set -eu
 
 # Retrieve arguments
-server_password=$1
-su_passwd=$2
-welcometext=$3
-port=$4
-registerName=$5
+app="mumbleserver"
+server_password=$YNH_APP_ARG_SERVER_LOGIN_PASSWORD
+su_passwd=$YNH_APP_ARG_PASSWORD
+welcometext=$YNH_APP_ARG_WELCOMETEXT
+port=$YNH_APP_ARG_PORT
+registerName=$YNH_APP_ARG_REGISTERNAME
+
+# Source YunoHost helpers
+source /usr/share/yunohost/helpers
 
-mumble_conf=/etc/mumble-server.ini
 # Check port availability
 sudo yunohost app checkport $port
 if [[ ! $? -eq 0 ]]; then
-	exit 1
+	ynh_die
 fi
 
-#check if su_password is not empty
+# Check if su_password is not empty
 if [[ -z "$su_passwd" ]]; then
-	exit 1
+	ynh_die
 fi
 
 # Save app settings
-sudo yunohost app setting $app port -v "$port"
+ynh_app_setting_set $app port "$port"
 
-# install via apt-get
-sudo apt-get update > /dev/null 2>&1
-sudo apt-get install -y mumble-server > /dev/null 2>&1
+# Install Mumble Debian package via apt
+sudo apt update > /dev/null 2>&1
+sudo apt install -y mumble-server > /dev/null 2>&1
 
-#copying conf file
+# Configuring with given settings
+mumble_conf="../conf/mumble-server.ini"
+sudo sed -i "s/welcometext=.*/welcometext=$welcometext/" $mumble_conf
+sudo sed -i "s/port=.*/port=$port/" $mumble_conf
+sudo sed -i "s/serverpassword=.*/serverpassword=$server_password/" $mumble_conf
+sudo sed -i "s/#registerName=.*/registerName=$registerName/" $mumble_conf
+
+# Copying conf file
+mumble_conf="/etc/mumble-server.ini"
 sudo cp ../conf/mumble-server.ini $mumble_conf
 sudo chmod 660  $mumble_conf
 sudo chown :mumble-server $mumble_conf
 
-#configuring with given settings
-sudo sed -i "s/welcometext=.*/welcometext=$welcometext/g" $mumble_conf
-sudo sed -i "s/port=.*/port=$port/g" $mumble_conf
-sudo sed -i "s/serverpassword=.*/serverpassword=$server_password/g" $mumble_conf
-sudo sed -i "s/#registerName=.*/registerName=$registerName/g" $mumble_conf
-
-#open port in firewall
+# Open port in firewall
 sudo yunohost firewall allow Both $port > /dev/null 2>&1
-sudo yunohost firewall allow --ipv6 Both $port > /dev/null 2>&1
 
-#starting mumble server 
+# Start Mumble server
 sudo /etc/init.d/mumble-server start
 
-#setting super-user password
+# Set super-user password
 sudo murmurd -supw $su_passwd
-#restart mumble server
+
+# Restart Mumble server
 sudo /etc/init.d/mumble-server restart
 
-#adding mumble as a service
-sudo yunohost service add mumble-server -l /var/log/mumble-server/mumble-server.log
\ No newline at end of file
+# Add Mumble as a YunoHost service
+sudo yunohost service add mumble-server -l /var/log/mumble-server/mumble-server.log
diff --git a/scripts/remove b/scripts/remove
index 6496857..53bd38f 100644
--- a/scripts/remove
+++ b/scripts/remove
@@ -1,14 +1,23 @@
 #!/bin/bash
 
+# Exit and treat unset variables as an error
+set -u
+
+# Source YunoHost helpers
+source /usr/share/yunohost/helpers
+
 app=mumbleserver
-#getting port used by mumble to close it
-port=$(sudo yunohost app setting $app port)
-#uninstall mumble and its dependencies
-sudo apt-get autoremove -y mumble-server > /dev/null 2>&1
-#close ports
+
+# Getting port used by mumble to close it
+port=$(ynh_app_setting_get $app port)
+
+# Uninstall Mumble and its dependencies
+sudo apt autoremove -y mumble-server > /dev/null 2>&1
+
+# Close ports
 sudo yunohost firewall disallow Both $port > /dev/null 2>&1
-sudo yunohost firewall disallow --ipv6 Both $port > /dev/null 2>&1
-#removing config file 
+
+# Removing config file
 sudo rm -f /etc/mumble-server.ini
 
 # Remove mumble-server service
diff --git a/scripts/upgrade b/scripts/upgrade
index 05a7907..a1a1178 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -1,2 +1,4 @@
 #!/bin/bash
 
+# Exit on command errors and treat unset variables as an error
+set -eu