diff --git a/check_process b/check_process
index 9dc103e..0658fdd 100644
--- a/check_process
+++ b/check_process
@@ -13,14 +13,9 @@
 		upgrade=1	from_commit=7a99e018f12d91876c84efd04e0a4e7f178fdd80
 		backup_restore=1
 		multi_instance=1
-		wrong_user=1
-		wrong_path=1
 		port_already_use=0
 		change_url=1
-	;;; Levels
-		# If the level 5 (Package linter) is forced to 1. Please add justifications here.
-		Level 5=auto
-	;;; Upgrade options
-		; commit=7a99e018f12d91876c84efd04e0a4e7f178fdd80
-			name=Upgrade to upstream version 2018-04-06
-			manifest_arg=domain=DOMAIN&path=PATH&
+;;; Upgrade options
+	; commit=7a99e018f12d91876c84efd04e0a4e7f178fdd80
+		name=Upgrade to upstream version 2018-04-06
+		manifest_arg=domain=DOMAIN&path=PATH&
diff --git a/conf/nginx.conf b/conf/nginx.conf
index 37de41d..556b622 100644
--- a/conf/nginx.conf
+++ b/conf/nginx.conf
@@ -9,7 +9,6 @@ location __PATH__/ {
     rewrite ^ https://$server_name$request_uri? permanent;
   }
 
-### Example PHP configuration (remove it if not used)
   index index.php;
 
   # Common parameter to increase upload size limit in conjunction with dedicated php-fpm file
@@ -26,7 +25,6 @@ location __PATH__/ {
     fastcgi_param PATH_INFO $fastcgi_path_info;
     fastcgi_param SCRIPT_FILENAME $request_filename;
   }
-### End of PHP configuration part
 
   # Include SSOWAT user panel.
   include conf.d/yunohost_panel.conf.inc;
diff --git a/manifest.json b/manifest.json
index b62f087..076999c 100644
--- a/manifest.json
+++ b/manifest.json
@@ -15,11 +15,11 @@
     },
     "multi_instance": true,
     "requirements": {
-        "yunohost": ">= 3.7"
+        "yunohost": ">= 4.0.0"
     },
     "services": [
         "nginx",
-        "php7.0-fpm",
+        "php7.3-fpm",
         "mysql"
     ],
     "arguments": {
diff --git a/scripts/change_url b/scripts/change_url
index 9eae8dd..d6c6747 100644
--- a/scripts/change_url
+++ b/scripts/change_url
@@ -99,6 +99,7 @@ fi
 # RELOAD NGINX
 #=================================================
 ynh_script_progression --message="Reloading NGINX web server..." --weight=1
+
 ynh_systemd_action --service_name=nginx --action=reload
 
 #=================================================
diff --git a/scripts/install b/scripts/install
index 190df5a..b5b54bb 100644
--- a/scripts/install
+++ b/scripts/install
@@ -88,8 +88,8 @@ phpversion=$(ynh_app_setting_get --app=$app --key=phpversion)
 #=================================================
 # SPECIFIC SETUP
 #=================================================
-
 ynh_script_progression --message="Configuring RSS-Bridge..." --weight=1
+
 # Enable every bridge
 for i in $final_path/bridges/*.php ; do 
   echo $(basename $i) | sed "s|Bridge.php$||g" | tee -a $final_path/whitelist.txt
@@ -108,10 +108,13 @@ chown -R $app: $final_path/cache
 #=================================================
 # SETUP SSOWAT
 #=================================================
-ynh_script_progression --message="Configuring SSOwat..." --weight=1
+ynh_script_progression --message="Configuring permissions..." --weight=1
 
-# unprotected_uris allows SSO credentials to be passed anyway.
-ynh_app_setting_set --app=$app --key=unprotected_uris --value="/"
+# Make app public if necessary
+if [ $is_public -eq 1 ]
+then
+	ynh_permission_update --permission="main" --add="visitors"
+fi
 
 #=================================================
 # RELOAD NGINX
diff --git a/scripts/upgrade b/scripts/upgrade
index 5a998de..e5813e1 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -27,6 +27,18 @@ phpversion=$(ynh_app_setting_get --app=$app --key=phpversion)
 
 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
+
 #=================================================
 # BACKUP BEFORE UPGRADE THEN ACTIVE TRAP
 #=================================================
@@ -41,13 +53,6 @@ ynh_clean_setup () {
 # Exit if an error occurs during the execution of the script
 ynh_abort_if_errors
 
-#=================================================
-# CHECK THE PATH
-#=================================================
-
-# Normalize the URL path syntax
-path_url=$(ynh_normalize_url_path --path_url=$path_url)
-
 #=================================================
 # DOWNLOAD, CHECK AND UNPACK SOURCE
 #=================================================
@@ -102,14 +107,6 @@ done
 chown -R root: $final_path
 chown -R $app: $final_path/cache
 
-#=================================================
-# SETUP SSOWAT
-#=================================================
-ynh_script_progression --message="Upgrading SSOwat configuration..." --weight=1
-
-# unprotected_uris allows SSO credentials to be passed anyway
-ynh_app_setting_set --app=$app --key=unprotected_uris --value="/"
-
 #=================================================
 # RELOAD NGINX
 #=================================================