diff --git a/README.md b/README.md
index 7bfb6ef..d85ec37 100644
--- a/README.md
+++ b/README.md
@@ -20,7 +20,7 @@ If you don't have YunoHost, please consult [the guide](https://yunohost.org/#/in
 Moodle is widely used around the world by universities, schools, companies and all manner of organisations and individuals.
 
 
-**Shipped version:** 4.0.1~ynh2
+**Shipped version:** 4.0.1~ynh3
 
 **Demo:** https://sandbox.moodledemo.net/
 
diff --git a/README_fr.md b/README_fr.md
index c0aa963..43fd44d 100644
--- a/README_fr.md
+++ b/README_fr.md
@@ -20,7 +20,7 @@ Si vous n'avez pas YunoHost, regardez [ici](https://yunohost.org/#/install) pour
 Moodle est largement utilisé dans le monde entier par les universités, les écoles, les entreprises et toutes sortes d'organisations et d'individus.
 
 
-**Version incluse :** 4.0.1~ynh2
+**Version incluse :** 4.0.1~ynh3
 
 **Démo :** https://sandbox.moodledemo.net/
 
diff --git a/manifest.json b/manifest.json
index d412fb9..67e91f9 100644
--- a/manifest.json
+++ b/manifest.json
@@ -6,7 +6,7 @@
         "en": "Online learning platform",
         "fr": "Plateforme d'apprentissage en ligne"
     },
-    "version": "4.0.1~ynh2",
+    "version": "4.0.1~ynh3",
     "url": "https://moodle.org/",
     "upstream": {
         "license": "GPL-3.0-or-later",
diff --git a/scripts/change_url b/scripts/change_url
index c4d9d1b..99e8e31 100644
--- a/scripts/change_url
+++ b/scripts/change_url
@@ -108,12 +108,16 @@ domain=${new_domain%/}
 path=${new_path%/}
 dir="__DIR__"
 
+ynh_backup_if_checksum_is_different --file="$final_path/config.php"
+
 if [ "$new_path" == "/" ]; then
 	ynh_add_config --template="../conf/config-domain.php" --destination="$final_path/config.php"
 else
 	ynh_add_config --template="../conf/config-path.php" --destination="$final_path/config.php"
 fi
 
+ynh_store_file_checksum --file="$final_path/config.php"
+
 #=================================================
 # RELOAD NGINX
 #=================================================
diff --git a/scripts/restore b/scripts/restore
index 3c61a99..931c5ee 100644
--- a/scripts/restore
+++ b/scripts/restore
@@ -20,7 +20,7 @@ ynh_abort_if_errors
 #=================================================
 # LOAD SETTINGS
 #=================================================
-ynh_script_progression --message="Loading settings..." --weight=1
+ynh_script_progression --message="Loading installation settings..." --weight=1
 
 app=$YNH_APP_INSTANCE_NAME
 
@@ -59,7 +59,6 @@ ynh_script_progression --message="Restoring the app main directory..." --weight=
 
 ynh_restore_file --origin_path="$final_path"
 
-# Restore permissions on app files
 chmod 750 "$final_path"
 chmod -R o-rwx "$final_path"
 chown -R $app:www-data "$final_path"
diff --git a/scripts/upgrade b/scripts/upgrade
index 0a88f8e..2bfcf9e 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -109,9 +109,23 @@ if [ "$upgrade_type" == "UPGRADE_APP" ]
 then
 	ynh_script_progression --message="Upgrading source files..." --weight=6
 
+	# Create a temporary directory
+	tmpdir="$(mktemp -d)"
+
+	# Backup the config file in the temp dir
+	cp -a "$final_path/config.php" "$tmpdir/config.php"
+
+	# Remove the app directory securely
+	ynh_secure_remove --file="$final_path"
+
 	# Download, check integrity, uncompress and patch the source from app.src
-	ynh_setup_source --dest_dir="$final_path" --keep="$final_path/config.php"
-	#php${phpversion} $final_path/admin/cli/upgrade.php
+	ynh_setup_source --dest_dir="$final_path"
+
+	# Copy the admin saved settings from tmp directory to final path 
+	cp -a "$tmpdir/config.php" "$final_path/config.php" 
+
+	# Remove the tmp directory securely
+	ynh_secure_remove --file="$tmpdir"
 fi
 
 chmod 750 "$final_path"