diff --git a/manifest.json b/manifest.json
index 34040ba..3974e8b 100644
--- a/manifest.json
+++ b/manifest.json
@@ -14,7 +14,7 @@
         "email": "gofannon@riseup.net"
     },
     "requirements": {
-        "yunohost": ">= 3.8.1"
+        "yunohost": ">= 4.1.7"
     },
     "multi_instance": true,
     "services": [
@@ -25,29 +25,17 @@
             {
                 "name": "domain",
                 "type": "domain",
-                "ask": {
-                    "en": "Choose a domain name for Airsonic",
-                    "fr": "Choisissez un nom de domaine pour Airsonic"
-                },
                 "example": "example.com"
             },
             {
                 "name": "path",
                 "type": "path",
-                "ask": {
-                    "en": "Choose a path for Airsonic",
-                    "fr": "Choisissez un chemin pour Airsonic"
-                },
                 "example": "/airsonic",
                 "default": "/airsonic"
             },
             {
                 "name": "admin",
                 "type": "user",
-                "ask": {
-                    "en": "Choose an admin user",
-                    "fr": "Choisissez l’administrateur"
-                },
                 "help": {
                     "en": "This user will have full control on this application and will be able to configure it.",
                     "fr": "Cet utilisateur aura le controle total de l'application et pourra la configurer."
@@ -57,10 +45,6 @@
             {
                 "name": "is_public",
                 "type": "boolean",
-                "ask": {
-                    "en": "Is it a public application?",
-                    "fr": "Est-ce une application publique ?"
-                },
                 "default": true
             }
         ]
diff --git a/pull_request_template.md b/pull_request_template.md
index 369c4b5..6c28fc5 100644
--- a/pull_request_template.md
+++ b/pull_request_template.md
@@ -11,12 +11,6 @@
 - [ ] Upgrade from last version tested.
 - [ ] Can be reviewed and tested.
 
-## Validation
----
-- [ ] **Code review**
-- [ ] **Approval (LGTM)**  
-*Code review and approval have to be from a member of @YunoHost/apps group*
-
 ## Package_check results
 ---
 * An automatic package_check will be launch at https://ci-apps-dev.yunohost.org/, when you add a specific comment to your Pull Request: "!testme", "!gogogadgetoci" or "By the power of systemd, I invoke The Great App CI to test this Pull Request!"*
diff --git a/scripts/backup b/scripts/backup
index 02481ad..b985e2c 100644
--- a/scripts/backup
+++ b/scripts/backup
@@ -28,7 +28,7 @@ app=$YNH_APP_INSTANCE_NAME
 
 final_path=$(ynh_app_setting_get --app=$app --key=final_path)
 domain=$(ynh_app_setting_get --app=$app --key=domain)
-service_config=$(ynh_app_setting_get --app=$app --key=service_config)
+#service_config=$(ynh_app_setting_get --app=$app --key=service_config)
 
 #=================================================
 # DECLARE DATA AND CONF FILES TO BACKUP
@@ -60,7 +60,7 @@ ynh_backup --src_path="/etc/logrotate.d/$app"
 #=================================================
 
 ynh_backup --src_path="/etc/systemd/system/$app.service"
-ynh_backup --src_path="$service_config"
+ynh_backup --src_path="/etc/default/$app"
 
 #=================================================
 # BACKUP DATA
diff --git a/scripts/change_url b/scripts/change_url
index 2a4ea92..087e3d4 100644
--- a/scripts/change_url
+++ b/scripts/change_url
@@ -28,9 +28,26 @@ ynh_script_progression --message="Loading installation settings..." --weight=1
 
 # Needed for helper "ynh_add_nginx_config"
 final_path=$(ynh_app_setting_get --app=$app --key=final_path)
-service_config=$(ynh_app_setting_get --app=$app --key=service_config)
+# service_config=$(ynh_app_setting_get --app=$app --key=service_config)
 port=$(ynh_app_setting_get --app=$app --key=port)
 
+#=================================================
+# BACKUP BEFORE UPGRADE THEN ACTIVE TRAP
+#=================================================
+ynh_script_progression --message="Backing up the app before changing its URL (may take a while)..." --time --weight=1
+
+# Backup the current version of the app
+ynh_backup_before_upgrade
+ynh_clean_setup () {
+	# Remove the new domain config file, the remove script won't do it as it doesn't know yet its location.
+	ynh_secure_remove --file="/etc/nginx/conf.d/$new_domain.d/$app.conf"
+
+	# Restore it if the upgrade fails
+	ynh_restore_upgradebackup
+}
+# Exit if an error occurs during the execution of the script
+ynh_abort_if_errors
+
 #=================================================
 # CHECK WHICH PARTS SHOULD BE CHANGED
 #=================================================
@@ -95,14 +112,16 @@ ynh_script_progression --message="Configuring a systemd service..." --weight=3
 # Create a dedicated systemd config
 ynh_add_systemd_config
 
-ynh_backup_if_checksum_is_different --file="$service_config"
+# ynh_backup_if_checksum_is_different --file="$service_config"
 
 # Copy config. template to right location
-cp ../conf/systemd-sysconfig $service_config
+# cp ../conf/systemd-sysconfig $service_config
 
-ynh_replace_string --match_string="__FINALPATH__" --replace_string=$final_path --target_file="$service_config"
-ynh_replace_string --match_string="__PORT__" --replace_string=$port --target_file="$service_config"
-ynh_replace_string --match_string="__PATH__" --replace_string=$path_url --target_file="$service_config"
+# ynh_replace_string --match_string="__FINALPATH__" --replace_string=$final_path --target_file="$service_config"
+# ynh_replace_string --match_string="__PORT__" --replace_string=$port --target_file="$service_config"
+# ynh_replace_string --match_string="__PATH__" --replace_string=$path_url --target_file="$service_config"
+
+ynh_add_config --template="../conf/systemd-sysconfig" --destination="/etc/default/$app"
 
 #=================================================
 # GENERIC FINALISATION
@@ -111,7 +130,7 @@ ynh_replace_string --match_string="__PATH__" --replace_string=$path_url --target
 #=================================================
 ynh_script_progression --message="Starting a systemd service..." --weight=12
 
-ynh_systemd_action --service_name=$app --action="start" --log_path="$final_path/airsonic.log" --line_match="Started Application in"
+ynh_systemd_action --service_name=$app --action=start --log_path="$final_path/airsonic.log" --line_match="Started Application in"
 
 #=================================================
 # RELOAD NGINX
diff --git a/scripts/install b/scripts/install
index 7c43309..b2ce83b 100644
--- a/scripts/install
+++ b/scripts/install
@@ -49,7 +49,6 @@ ynh_script_progression --message="Storing installation settings..." --weight=2
 ynh_app_setting_set --app=$app --key=domain --value=$domain
 ynh_app_setting_set --app=$app --key=path --value=$path_url
 ynh_app_setting_set --app=$app --key=admin --value=$admin
-ynh_app_setting_set --app=$app --key=is_public --value=$is_public
 
 #=================================================
 # STANDARD MODIFICATIONS
@@ -156,27 +155,23 @@ ynh_add_systemd_config
 #=================================================
 
 # Path of the systemd service configuration
-service_config="/etc/default/$app"
+# service_config="/etc/default/$app"
 
-ynh_app_setting_set --app=$app --key=service_config --value=$service_config
+# ynh_app_setting_set --app=$app --key=service_config --value=$service_config
 
 # Copy config. template to right location
-cp ../conf/systemd-sysconfig $service_config
+# cp ../conf/systemd-sysconfig $service_config
 
-ynh_replace_string --match_string="__FINALPATH__" --replace_string=$final_path --target_file="$service_config"
-ynh_replace_string --match_string="__PORT__" --replace_string=$port --target_file="$service_config"
-ynh_replace_string --match_string="__PATH__" --replace_string=$path_url --target_file="$service_config"
+# ynh_replace_string --match_string="__FINALPATH__" --replace_string=$final_path --target_file="$service_config"
+# ynh_replace_string --match_string="__PORT__" --replace_string=$port --target_file="$service_config"
+# ynh_replace_string --match_string="__PATH__" --replace_string=$path_url --target_file="$service_config"
+
+ynh_add_config --template="../conf/systemd-sysconfig" --destination="/etc/default/$app"
 
 # Copy configuration file of airsonic
 cp ../conf/airsonic.properties $final_path/airsonic.properties
-
-#=================================================
-# STORE THE CONFIG FILES CHECKSUM
-#=================================================
-
 # Calculate and store the config file checksum into the app settings
 ynh_store_file_checksum --file="$final_path/airsonic.properties"
-ynh_store_file_checksum --file="$service_config"
 
 #=================================================
 # GENERIC FINALIZATION
@@ -207,7 +202,7 @@ yunohost service add $app --description="Airsonic daemon" --log="$final_path/$ap
 ynh_script_progression --message="Starting a systemd service..." --weight=12
 
 # Start a systemd service
-ynh_systemd_action --service_name=$app --action="start" --log_path="$final_path/$app.log" --line_match="Started Application in"
+ynh_systemd_action --service_name=$app --action=start --log_path="$final_path/$app.log" --line_match="Started Application in"
 
 #=================================================
 # SETUP APPLICATION WITH CURL
@@ -219,6 +214,8 @@ ynh_permission_update --permission="main" --add="visitors"
 # Reload Nginx
 ynh_systemd_action --service_name=nginx --action=reload
 
+ynh_script_progression --message="Finalizing installation..." --weight=10
+
 mailadmin=$(ynh_user_get_info --username=$admin --key=mail)
 
 #http://www.subsonic.org/pages/api.jsp
diff --git a/scripts/remove b/scripts/remove
index dc438a9..e09307a 100644
--- a/scripts/remove
+++ b/scripts/remove
@@ -19,7 +19,7 @@ app=$YNH_APP_INSTANCE_NAME
 domain=$(ynh_app_setting_get --app=$app --key=domain)
 port=$(ynh_app_setting_get --app=$app --key=port)
 final_path=$(ynh_app_setting_get --app=$app --key=final_path)
-service_config=$(ynh_app_setting_get --app=$app --key=service_config)
+#service_config=$(ynh_app_setting_get --app=$app --key=service_config)
 
 #=================================================
 # STANDARD REMOVE
@@ -80,7 +80,7 @@ ynh_remove_logrotate
 # REMOVE FILES
 #=================================================
 
-ynh_secure_remove --file="$service_config"
+ynh_secure_remove --file="/etc/default/$app"
 
 #=================================================
 # GENERIC FINALIZATION
diff --git a/scripts/restore b/scripts/restore
index be2f4c6..87b37ae 100644
--- a/scripts/restore
+++ b/scripts/restore
@@ -30,7 +30,7 @@ app=$YNH_APP_INSTANCE_NAME
 domain=$(ynh_app_setting_get --app=$app --key=domain)
 path_url=$(ynh_app_setting_get --app=$app --key=path)
 final_path=$(ynh_app_setting_get --app=$app --key=final_path)
-service_config=$(ynh_app_setting_get --app=$app --key=service_config)
+#service_config=$(ynh_app_setting_get --app=$app --key=service_config)
 
 #=================================================
 # CHECK IF THE APP CAN BE RESTORED
@@ -108,7 +108,7 @@ chown $app: $final_path/transcode
 ynh_script_progression --message="Restoring the systemd configuration..." --weight=1
 
 ynh_restore_file --origin_path="/etc/systemd/system/$app.service"
-ynh_restore_file --origin_path="$service_config"
+ynh_restore_file --origin_path="/etc/default/$app"
 systemctl enable $app.service --quiet
 
 #=================================================
diff --git a/scripts/upgrade b/scripts/upgrade
index 6b1fd23..bd9a225 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -20,9 +20,8 @@ domain=$(ynh_app_setting_get --app=$app --key=domain)
 path_url=$(ynh_app_setting_get --app=$app --key=path)
 admin=$(ynh_app_setting_get --app=$app --key=admin)
 is_public=$(ynh_app_setting_get --app=$app --key=is_public)
-final_path=$(ynh_app_setting_get --app=$app --key=final_path)
 port=$(ynh_app_setting_get --app=$app --key=port)
-service_config=$(ynh_app_setting_get --app=$app --key=service_config)
+#service_config=$(ynh_app_setting_get --app=$app --key=service_config)
 
 #=================================================
 # CHECK VERSION
@@ -35,25 +34,23 @@ upgrade_type=$(ynh_check_app_version_changed)
 #=================================================
 ynh_script_progression --message="Ensuring downward compatibility..." --weight=1
 
-# Fix is_public as a boolean value
-if [ "$is_public" = "Yes" ]; then
-	ynh_app_setting_set --app=$app --key=is_public --value=1
-	is_public=1
-elif [ "$is_public" = "No" ]; then
-	ynh_app_setting_set --app=$app --key=is_public --value=0
-	is_public=0
-fi
-
 # If final_path doesn't exist, create it
 if [ -z "$final_path" ]; then
 	final_path=/opt/yunohost/$app
 	ynh_app_setting_set --app=$app --key=final_path --value=$final_path
 fi
 
-# If service_config doesn't exist, create it
-if [ -z "$service_config" ]; then
-	service_config="/etc/default/$app"
-	ynh_app_setting_set --app=$app --key=service_config --value=$service_config
+# # If service_config doesn't exist, create it
+# if [ -z "$service_config" ]; then
+# 	service_config="/etc/default/$app"
+# 	ynh_app_setting_set --app=$app --key=service_config --value=$service_config
+# fi
+
+# Cleaning legacy permissions
+if ynh_legacy_permissions_exists; then
+	ynh_legacy_permissions_delete_all
+
+	ynh_app_setting_delete --app=$app --key=is_public
 fi
 
 #=================================================
@@ -200,14 +197,16 @@ ynh_script_progression --message="Upgrading systemd configuration..." --weight=1
 # Create a dedicated systemd config
 ynh_add_systemd_config
 
-ynh_backup_if_checksum_is_different --file="$service_config"
+# ynh_backup_if_checksum_is_different --file="$service_config"
 
-# Copy config. template to right location
-cp ../conf/systemd-sysconfig $service_config
+# # Copy config. template to right location
+# cp ../conf/systemd-sysconfig $service_config
 
-ynh_replace_string --match_string="__FINALPATH__" --replace_string=$final_path --target_file="$service_config"
-ynh_replace_string --match_string="__PORT__" --replace_string=$port --target_file="$service_config"
-ynh_replace_string --match_string="__PATH__" --replace_string=$path_url --target_file="$service_config"
+# ynh_replace_string --match_string="__FINALPATH__" --replace_string=$final_path --target_file="$service_config"
+# ynh_replace_string --match_string="__PORT__" --replace_string=$port --target_file="$service_config"
+# ynh_replace_string --match_string="__PATH__" --replace_string=$path_url --target_file="$service_config"
+
+ynh_add_config --template="../conf/systemd-sysconfig" --destination="/etc/default/$app"
 
 #=================================================
 # GENERIC FINALIZATION