diff --git a/scripts/upgrade b/scripts/upgrade
index 16a7505..00700ee 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -16,11 +16,20 @@ ynh_script_progression --message="Loading installation settings..."
 
 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)
 final_path=$(ynh_app_setting_get --app=$app --key=final_path)
+
+domain=$(ynh_app_setting_get --app=$app --key=domain)
+port=$(ynh_app_setting_get --app=$app --key=port)
+
 db_name=$(ynh_app_setting_get --app=$app --key=db_name)
+db_user=$(ynh_app_setting_get --app=$app --key=db_user)
+db_pwd=$(ynh_app_setting_get --app=$app --key=db_pwd)
+
+registration=$(ynh_app_setting_get --app=$app --key=registration)
+registration_approval=$(ynh_app_setting_get --app=$app --key=registration_approval)
+registration_reason=$(ynh_app_setting_get --app=$app --key=registration_reason)
+
+datadir=$(ynh_app_setting_get --app=$app --key=datadir)
 
 #=================================================
 # CHECK VERSION
@@ -57,62 +66,6 @@ ynh_script_progression --message="Stopping a systemd service..."
 
 ynh_systemd_action --service_name=$app --action="stop" --log_path="/var/log/$app/$app.log"
 
-#=================================================
-# ENSURE DOWNWARD COMPATIBILITY
-#=================================================
-ynh_script_progression --message="Ensuring downward compatibility..."
-
-#
-# N.B. : the followings setting migrations snippets are provided as *EXAMPLES*
-# of what you may want to do in some cases (e.g. a setting was not defined on
-# some legacy installs and you therefore want to initiaze stuff during upgrade)
-#
-
-# If db_name doesn't exist, create it
-#if [ -z "$db_name" ]; then
-#	db_name=$(ynh_sanitize_dbid --db_name=$app)
-#	ynh_app_setting_set --app=$app --key=db_name --value=$db_name
-#fi
-
-# If final_path doesn't exist, create it
-#if [ -z "$final_path" ]; then
-#	final_path=/var/www/$app
-#	ynh_app_setting_set --app=$app --key=final_path --value=$final_path
-#fi
-
-### If nobody installed your app before 4.1,
-### then you may safely remove these lines
-
-# Cleaning legacy permissions
-if ynh_legacy_permissions_exists; then
-	ynh_legacy_permissions_delete_all
-
-	ynh_app_setting_delete --app=$app --key=is_public
-fi
-
-if ! ynh_permission_exists --permission="admin"; then
-	# Create the required permissions
-	ynh_permission_create --permission="admin" --url="/admin" --allowed=$admin
-fi
-
-# Create a permission if needed
-if ! ynh_permission_exists --permission="api"; then
-	ynh_permission_create --permission="api" --url="/api" --allowed="visitors" --show_tile="false" --protected="true"
-fi
-
-#Switch variables name
-psql_db=$(ynh_app_setting_get --app=$app --key=psql_db)
-
-if [ -n "$psql_db" ]
-then
-	db_name=$(ynh_app_setting_get --app=$app --key=psql_db)
-	db_pwd=$(ynh_app_setting_get --app=$app --key=psqlpwd)
-	ynh_app_setting_set --app=$app --key=db_name --value=$db_name
-	ynh_app_setting_set --app=$app --key=db_pwd --value=$db_pwd
-	ynh_app_setting_delete --app=$app --key=psql_db
-	ynh_app_setting_delete --app=$app --key=psqlpwd
-fi
-
 #=================================================
 # CREATE DEDICATED USER
 #=================================================