diff --git a/scripts/upgrade b/scripts/upgrade
index f38c139..dce88f2 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -18,23 +18,35 @@ app=$YNH_APP_INSTANCE_NAME
 
 domain=$(ynh_app_setting_get --app=$app --key=domain)
 path_url=$(ynh_app_setting_get --app=$app --key=path)
-language=$(ynh_app_setting_get --app=$app --key=language)
-admin=$(ynh_app_setting_get --app=$app --key=admin)
 final_path=$(ynh_app_setting_get --app=$app --key=final_path)
 db_name=$(ynh_app_setting_get --app=$app --key=db_name)
+db_pwd=$(ynh_app_setting_get --app=$app --key=psqlpwd)
+port=$(ynh_app_setting_get --app=$app --key=port)
 
 #=================================================
 # CHECK VERSION
 #=================================================
+ynh_script_progression --message="Checking version..."
 
-### This helper will compare the version of the currently installed app and the version of the upstream package.
-### $upgrade_type can have 2 different values
-### - UPGRADE_APP if the upstream app version has changed
-### - UPGRADE_PACKAGE if only the YunoHost package has changed
-### ynh_check_app_version_changed will stop the upgrade if the app is up to date.
-### UPGRADE_APP should be used to upgrade the core app only if there's an upgrade to do.
 upgrade_type=$(ynh_check_app_version_changed)
 
+#=================================================
+# ENSURE DOWNWARD COMPATIBILITY
+#=================================================
+
+if ynh_compare_current_package_version --comparison lt --version 12.105.0~ynh1
+then
+	ynh_die --message="Sorry, this version is not upgradable to the latest version :("
+fi
+
+#=================================================
+# STOP SYSTEMD SERVICE
+#=================================================
+ynh_script_progression --message="Stopping a systemd service..." --weight=1
+
+# Stop bservice before backup, to not loose message in case of failed upgrade and restore
+ynh_systemd_action --service_name=$app --action="stop" --log_path=systemd --line_match="Stopped"
+
 #=================================================
 # BACKUP BEFORE UPGRADE THEN ACTIVE TRAP
 #=================================================
@@ -43,6 +55,7 @@ ynh_script_progression --message="Backing up the app before upgrading (may take
 # Backup the current version of the app
 ynh_backup_before_upgrade
 ynh_clean_setup () {
+	ynh_clean_check_starting
 	# Restore it if the upgrade fails
 	ynh_restore_upgradebackup
 }
@@ -51,38 +64,22 @@ ynh_abort_if_errors
 
 #=================================================
 # STANDARD UPGRADE STEPS
-#=================================================
-# STOP SYSTEMD SERVICE
-#=================================================
-ynh_script_progression --message="Stopping a systemd service..." --weight=1
-
-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..." --weight=1
 
-#
-# 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=$db_name
-#fi
+if [ -z "$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
+if [ -z "$final_path" ]; then
+	final_path=/var/www/$app
+	ynh_app_setting_set --app=$app --key=final_path --value=$final_path
+fi
 
 # Cleaning legacy permissions
 if ynh_legacy_permissions_exists; then
@@ -91,15 +88,6 @@ if ynh_legacy_permissions_exists; then
 	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
 
 #=================================================
 # CREATE DEDICATED USER
@@ -115,18 +103,12 @@ ynh_system_user_create --username=$app --home_dir="$final_path"
 
 if [ "$upgrade_type" == "UPGRADE_APP" ]
 then
-	ynh_script_progression --message="Upgrading source files..." --weight=1
+	ynh_script_progression --message="Upgrading source files..."
 
 	# Download, check integrity, uncompress and patch the source from app.src
-	ynh_setup_source --dest_dir="$final_path"
+	ynh_setup_source --dest_dir="$final_path" --keep=".config/default.yml"
 fi
 
-# FIXME: this should be managed by the core in the future
-# Here, as a packager, you may have to tweak the ownerhsip/permissions
-# such that the appropriate users (e.g. maybe www-data) can access
-# files in some cases.
-# But FOR THE LOVE OF GOD, do not allow r/x for "others" on the entire folder -
-# this will be treated as a security issue.
 chmod 750 "$final_path"
 chmod -R o-rwx "$final_path"
 chown -R $app:www-data "$final_path"
@@ -134,56 +116,32 @@ chown -R $app:www-data "$final_path"
 #=================================================
 # UPGRADE DEPENDENCIES
 #=================================================
-ynh_script_progression --message="Upgrading dependencies..." --weight=1
+ynh_script_progression --message="Upgrading dependencies..." --weight=5
 
-ynh_install_app_dependencies $pkg_dependencies
-
-#=================================================
-# PHP-FPM CONFIGURATION
-#=================================================
-ynh_script_progression --message="Upgrading PHP-FPM configuration..." --weight=1
-
-# Create a dedicated PHP-FPM config
-ynh_add_fpm_config
+ynh_install_nodejs --nodejs_version=$NODEJS_VERSION
+ynh_exec_warn_less ynh_install_app_dependencies $pkg_dependencies
+ynh_install_extra_app_dependencies --repo="deb https://dl.yarnpkg.com/debian/ stable main" --package="yarn" --key="https://dl.yarnpkg.com/debian/pubkey.gpg"
 
 #=================================================
 # NGINX CONFIGURATION
 #=================================================
-ynh_script_progression --message="Upgrading NGINX web server configuration..." --time --weight=1
+ynh_script_progression --message="Upgrading NGINX web server configuration..." --weight=1
 
 # Create a dedicated NGINX config
 ynh_add_nginx_config
 
 #=================================================
-# SPECIFIC UPGRADE
-#=================================================
-# ...
+# BUILD APP
 #=================================================
+ynh_script_progression --message="Building app..."
 
-#=================================================
-# UPDATE A CONFIG FILE
-#=================================================
-ynh_script_progression --message="Updating a configuration file..." --weight=1
-
-### Same as during install
-###
-### The file will automatically be backed-up if it's found to be manually modified (because
-### ynh_add_config keeps track of the file's checksum)
-
-ynh_add_config --template="some_config_file" --destination="$final_path/some_config_file"
-
-# FIXME: this should be handled by the core in the future
-# You may need to use chmod 600 instead of 400,
-# for example if the app is expected to be able to modify its own config
-chmod 400 "$final_path/some_config_file"
-chown $app:$app "$final_path/some_config_file"
-
-### For more complex cases where you want to replace stuff using regexes,
-### you shoud rely on ynh_replace_string (which is basically a wrapper for sed)
-### When doing so, you also need to manually call ynh_store_file_checksum
-###
-### ynh_replace_string --match_string="match_string" --replace_string="replace_string" --target_file="$final_path/some_config_file"
-### ynh_store_file_checksum --file="$final_path/some_config_file"
+pushd "$final_path"
+    ynh_use_nodejs
+    ynh_exec_warn_less ynh_exec_as $app env $ynh_node_load_PATH yarn cleanall
+	ynh_exec_warn_less ynh_exec_as $app env $ynh_node_load_PATH yarn install
+	ynh_exec_warn_less ynh_exec_as $app env $ynh_node_load_PATH NODE_ENV=production yarn build
+	ynh_exec_warn_less ynh_exec_as $app env $ynh_node_load_PATH yarn migrate
+popd
 
 #=================================================
 # SETUP SYSTEMD
@@ -208,22 +166,14 @@ ynh_use_logrotate --non-append
 #=================================================
 ynh_script_progression --message="Integrating service in YunoHost..." --weight=1
 
-yunohost service add $app --description="A short description of the app" --log="/var/log/$app/$app.log"
+yunohost service add $app --description="A interplanetary blogging platform" --log="/var/log/$app/$app.log"
 
 #=================================================
 # START SYSTEMD SERVICE
 #=================================================
 ynh_script_progression --message="Starting a systemd service..." --weight=1
 
-ynh_systemd_action --service_name=$app --action="start" --log_path="/var/log/$app/$app.log"
-
-#=================================================
-# UPGRADE FAIL2BAN
-#=================================================
-ynh_script_progression --message="Reconfiguring Fail2Ban..." --weight=1
-
-# Create a dedicated Fail2Ban config
-ynh_add_fail2ban_config --logpath="/var/log/nginx/${domain}-error.log" --failregex="Regex to match into the log for a failed login"
+ynh_systemd_action --service_name=$app --action="start" --log_path=systemd --line_match="All workers started"
 
 #=================================================
 # RELOAD NGINX