diff --git a/scripts/install b/scripts/install
index 359b09a..ecb45af 100644
--- a/scripts/install
+++ b/scripts/install
@@ -51,7 +51,6 @@ 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=$app --key=final_path --value=$final_path
-ynh_app_setting_set --app=$app --key=is_public --value=$is_public
 
 #=================================================
 # STANDARD MODIFICATIONS
@@ -160,11 +159,11 @@ if [ $is_public -eq 1 ]
 then
 	# Everyone can access the app.
 	# The "main" permission is automatically created before the install script.
-	ynh_permission_update --permission "main" --add "visitors"
+	ynh_permission_update --permission="main" --add="visitors"
 fi
 
 # Only the admin can access the admin panel of the app (if the app has an admin panel)
-ynh_permission_create --permission "admin" --allowed $admin
+ynh_permission_create --permission="admin" --allowed=$admin
 
 #=================================================
 # RELOAD NGINX
diff --git a/scripts/upgrade b/scripts/upgrade
index ed18b31..5fb1c2f 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -18,7 +18,6 @@ app=$YNH_APP_INSTANCE_NAME
 domain=$(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)
 
@@ -28,6 +27,23 @@ port=$(ynh_app_setting_get --app=$app --key=port)
 
 upgrade_type=$(ynh_check_app_version_changed)
 
+#=================================================
+# ENSURE DOWNWARD COMPATIBILITY
+#=================================================
+ynh_script_progression --message="Ensuring downward compatibility..." --weight=1
+
+# Cleaning legacy permissions
+if ynh_legacy_permissions_exists; then
+	ynh_legacy_permissions_delete_all
+
+	ynh_app_setting_delete --app=$app --key=is_public
+fi
+
+if ! ynh_permission_exists --permission="admin"; then
+	# Create the required permissions
+	ynh_permission_create --permission="admin" --allowed=$admin
+fi
+
 #=================================================
 # BACKUP BEFORE UPGRADE THEN ACTIVE TRAP
 #=================================================
@@ -83,7 +99,7 @@ if [ -z "/etc/jellyfin/network.xml" ]; then
 	ynh_script_progression --message="Configuring the settings..." --weight=1
 
 	# Load services once to generate network.xml
-	systemctl enable jellyfin
+	systemctl enable jellyfin --quiet
 	systemctl start jellyfin
 	sleep 5
 	systemctl stop jellyfin
@@ -127,16 +143,6 @@ ynh_script_progression --message="Upgrading logrotate configuration..." --weight
 # Use logrotate to manage app-specific logfile(s)
 ynh_use_logrotate --non-append
 
-#=================================================
-# SETUP SSOWAT
-#=================================================
-ynh_script_progression --message="Upgrading permissions configuration..." --weight=1
-
-# Create the admin permission if needed
-if ! ynh_permission_exists --permission "admin"; then
-	ynh_permission_create --permission "admin" --allowed $admin
-fi
-
 #=================================================
 # INTEGRATE SERVICE IN YUNOHOST
 #=================================================