diff --git a/check_process b/check_process
index afc2d18..222873f 100644
--- a/check_process
+++ b/check_process
@@ -27,19 +27,6 @@
 		incorrect_path=1
 		port_already_use=0
 		change_url=1
-;;; Levels
-	Level 1=auto
-	Level 2=auto
-	Level 3=auto
-# Level 4: If the app supports LDAP and SSOwat, turn level 4 to '1' and add a link to an issue or a part of your code to show it.
-# If the app does not use LDAP nor SSOwat, and can't use them, turn level 4 to 'na' and explain as well.
-	Level 4=0
-	Level 5=auto
-	Level 6=auto
-	Level 7=auto
-	Level 8=0
-	Level 9=0
-	Level 10=0
 ;;; Options
 Email=
 Notification=none
diff --git a/manifest.json b/manifest.json
index 214c967..a93e942 100644
--- a/manifest.json
+++ b/manifest.json
@@ -15,7 +15,7 @@
         "url": "https://miaou.org"
     },
     "requirements": {
-        "yunohost": ">= 3.4"
+        "yunohost": ">= 3.8.1"
     },
     "multi_instance": true,
     "services": [
diff --git a/scripts/install b/scripts/install
index dd98536..6a6c4d7 100755
--- a/scripts/install
+++ b/scripts/install
@@ -31,38 +31,23 @@ is_public=$YNH_APP_ARG_IS_PUBLIC
 language=$YNH_APP_ARG_LANGUAGE
 password=$YNH_APP_ARG_PASSWORD
 
-### If it's a multi-instance app, meaning it can be installed several times independently
-### The id of the app as stated in the manifest is available as $YNH_APP_ID
-### The instance number is available as $YNH_APP_INSTANCE_NUMBER (equals "1", "2", ...)
-### The app instance name is available as $YNH_APP_INSTANCE_NAME
-###    - the first time the app is installed, YNH_APP_INSTANCE_NAME = ynhexample
-###    - the second time the app is installed, YNH_APP_INSTANCE_NAME = ynhexample__2
-###    - ynhexample__{N} for the subsequent installations, with N=3,4, ...
-### The app instance name is probably what interests you most, since this is
-### guaranteed to be unique. This is a good unique identifier to define installation path,
-### db names, ...
 app=$YNH_APP_INSTANCE_NAME
 
 #=================================================
 # CHECK IF THE APP CAN BE INSTALLED WITH THESE ARGS
 #=================================================
-ynh_print_info "Validating installation parameters..."
+ynh_script_progression --message="Validating installation parameters..."
 
-### If the app uses nginx as web server (written in HTML/PHP in most cases), the final path should be "/var/www/$app".
-### If the app provides an internal web server (or uses another application server such as uwsgi), the final path should be "/opt/yunohost/$app"
 final_path=/var/www/$app
 test ! -e "$final_path" || ynh_die "This path already contains a folder"
 
-# Normalize the url path syntax
-path_url=$(ynh_normalize_url_path $path_url)
-
 # Register (book) web path
 ynh_webpath_register $app $domain $path_url
 
 #=================================================
 # STORE SETTINGS FROM MANIFEST
 #=================================================
-ynh_print_info "Storing installation settings..."
+ynh_script_progression --message="Storing installation settings..."
 
 ynh_app_setting_set $app domain $domain
 ynh_app_setting_set $app path $path_url
@@ -75,7 +60,7 @@ ynh_app_setting_set $app language $language
 #=================================================
 # FIND AND OPEN A PORT
 #=================================================
-ynh_print_info "Configuring firewall..."
+ynh_script_progression --message="Configuring firewall..."
 
 ### Use these lines if you have to open a port for the application
 ### `ynh_find_port` will find the first available port starting from the given port.
@@ -91,7 +76,7 @@ ynh_print_info "Configuring firewall..."
 #=================================================
 # INSTALL DEPENDENCIES
 #=================================================
-ynh_print_info "Installing dependencies..."
+ynh_script_progression --message="Installing dependencies..."
 
 ### `ynh_install_app_dependencies` allows you to add any "apt" dependencies to the package.
 ### Those deb packages will be installed as dependencies of this package.
@@ -105,16 +90,7 @@ ynh_print_info "Installing dependencies..."
 #=================================================
 # CREATE A MYSQL DATABASE
 #=================================================
-ynh_print_info "Creating a MySQL database..."
-
-### Use these lines if you need a database for the application.
-### `ynh_mysql_setup_db` will create a database, an associated user and a ramdom password.
-### The password will be stored as 'mysqlpwd' into the app settings,
-### and will be available as $db_pwd
-### If you're not using these lines:
-###		- Remove the section "BACKUP THE MYSQL DATABASE" in the backup script
-###		- Remove also the section "REMOVE THE MYSQL DATABASE" in the remove script
-###		- As well as the section "RESTORE THE MYSQL DATABASE" in the restore script
+ynh_script_progression --message="Creating a MySQL database..."
 
 db_name=$(ynh_sanitize_dbid $app)
 db_user=$db_name
@@ -124,11 +100,7 @@ ynh_mysql_setup_db $db_user $db_name
 #=================================================
 # DOWNLOAD, CHECK AND UNPACK SOURCE
 #=================================================
-ynh_print_info "Setting up source files..."
-
-### `ynh_setup_source` is used to install an app from a zip or tar.gz file,
-### downloaded from an upstream source, like a git repository.
-### `ynh_setup_source` use the file conf/app.src
+ynh_script_progression --message="Setting up source files..."
 
 ynh_app_setting_set $app final_path $final_path
 # Download, check integrity, uncompress and patch the source from app.src
@@ -137,9 +109,7 @@ ynh_setup_source "$final_path"
 #=================================================
 # NGINX CONFIGURATION
 #=================================================
-ynh_print_info "Configuring nginx web server..."
-
-### `ynh_add_nginx_config` will use the file conf/nginx.conf
+ynh_script_progression --message="Configuring nginx web server..."
 
 # Create a dedicated nginx config
 ynh_add_nginx_config
@@ -147,7 +117,7 @@ ynh_add_nginx_config
 #=================================================
 # CREATE DEDICATED USER
 #=================================================
-ynh_print_info "Configuring system user..."
+ynh_script_progression --message="Configuring system user..."
 
 # Create a system user
 ynh_system_user_create $app
@@ -155,32 +125,15 @@ ynh_system_user_create $app
 #=================================================
 # PHP-FPM CONFIGURATION
 #=================================================
-ynh_print_info "Configuring php-fpm..."
-
-### `ynh_add_fpm_config` is used to set up a PHP config.
-### You can remove it if your app doesn't use PHP.
-### `ynh_add_fpm_config` will use the files conf/php-fpm.conf and conf/php-fpm.ini
-### If you're not using these lines:
-###		- You can remove these files in conf/.
-###		- Remove the section "BACKUP THE PHP-FPM CONFIGURATION" in the backup script
-###		- Remove also the section "REMOVE PHP-FPM CONFIGURATION" in the remove script
-###		- As well as the section "RESTORE THE PHP-FPM CONFIGURATION" in the restore script
-###		With the reload at the end of the script.
-###		- And the section "PHP-FPM CONFIGURATION" in the upgrade script
+ynh_script_progression --message="Configuring php-fpm..."
 
 # Create a dedicated php-fpm config
 ynh_add_fpm_config
 
-#=================================================
-# SPECIFIC SETUP
-#=================================================
-# ...
-#=================================================
-
 #=================================================
 # SETUP SYSTEMD
 #=================================================
-ynh_print_info "Configuring a systemd service..."
+ynh_script_progression --message="Configuring a systemd service..."
 
 ### `ynh_systemd_config` is used to configure a systemd script for an app.
 ### It can be used for apps that use sysvinit (with adaptation) or systemd.
@@ -261,10 +214,6 @@ fi
 # SECURE FILES AND DIRECTORIES
 #=================================================
 
-### For security reason, any app should set the permissions to root: before anything else.
-### Then, if write authorization is needed, any access should be given only to directories
-### that really need such authorization.
-
 # Set permissions to app files
 chown -R root: $final_path
 chown -R $app:$app $final_path #modif perso
@@ -272,7 +221,7 @@ chown -R $app:$app $final_path #modif perso
 #=================================================
 # SETUP LOGROTATE
 #=================================================
-ynh_print_info "Configuring log rotation..."
+ynh_script_progression --message="Configuring log rotation..."
 
 ### `ynh_use_logrotate` is used to configure a logrotate configuration for the logs of this app.
 ### Use this helper only if there is effectively a log file for this app.
@@ -304,7 +253,7 @@ ynh_print_info "Configuring log rotation..."
 #=================================================
 # SETUP SSOWAT
 #=================================================
-ynh_print_info "Configuring SSOwat..."
+ynh_script_progression --message="Configuring SSOwat..."
 
 # Make app public if necessary
 if [ $is_public -eq 1 ]
@@ -316,7 +265,7 @@ fi
 #=================================================
 # RELOAD NGINX
 #=================================================
-ynh_print_info "Reloading nginx web server..."
+ynh_script_progression --message="Reloading nginx web server..."
 
 systemctl reload nginx
 
@@ -324,4 +273,4 @@ systemctl reload nginx
 # END OF SCRIPT
 #=================================================
 
-ynh_print_info "Installation of $app completed"
+ynh_script_progression --message="Installation of $app completed"