diff --git a/manifest.json b/manifest.json
index e71af46..9bc0ba2 100644
--- a/manifest.json
+++ b/manifest.json
@@ -36,15 +36,6 @@
                 },
                 "example": "johndoe@example.com"
             },
-            {
-                "name": "pass",
-                "type": "password",
-                "ask": {
-                    "en": "Enter password of this administrator(username:root).Should be greater then 6 character",
-                    "fr": "Ajouter le mot de passe pour cette administrateur ≥ 6 charactères"
-                },
-                "example": "battery horse staple nenuphar"
-            },
             {
                 "name": "port",
                 "ask": {
diff --git a/scripts/_common.sh b/scripts/_common.sh
index 24bd7ba..409055a 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -11,3 +11,52 @@ ynh_delete_file_checksum () {
 	local checksum_setting_name=checksum_${1//[\/ ]/_}	# Replace all '/' and ' ' by '_'
 	ynh_app_setting_delete $app $checksum_setting_name
 }
+
+# Send an email to inform the administrator
+#
+# usage: ynh_send_readme_to_admin app_message [recipients]
+# | arg: app_message - The message to send to the administrator.
+# | arg: recipients - The recipients of this email. Use spaces to separate multiples recipients. - default: root
+#	example: "root admin@domain"
+#	If you give the name of a YunoHost user, ynh_send_readme_to_admin will find its email adress for you
+#	example: "root admin@domain user1 user2"
+ynh_send_readme_to_admin() {
+	local app_message="${1:-...No specific information...}"
+	local recipients="${2:-root}"
+
+	# Retrieve the email of users
+	find_mails () {
+		local list_mails="$1"
+		local mail
+		local recipients=" "
+		# Read each mail in argument
+		for mail in $list_mails
+		do
+			# Keep root or a real email address as it is
+			if [ "$mail" = "root" ] || echo "$mail" | grep --quiet "@"
+			then
+				recipients="$recipients $mail"
+			else
+				# But replace an user name without a domain after by its email
+				if mail=$(ynh_user_get_info "$mail" "mail" 2> /dev/null)
+				then
+					recipients="$recipients $mail"
+				fi
+			fi
+		done
+		echo "$recipients"
+	}
+	recipients=$(find_mails "$recipients")
+
+	local mail_subject="☁️🆈🅽🅷☁️: \`$app\` was just installed!"
+
+	local mail_message="This is an automated message from your beloved YunoHost server.
+Specific information for the application $app.
+$app_message
+---
+Automatic diagnosis data from YunoHost
+$(yunohost tools diagnosis | grep -B 100 "services:" | sed '/services:/d')"
+
+	# Send the email to the recipients
+	echo "$mail_message" | mail -a "Content-Type: text/plain; charset=UTF-8" -s "$mail_subject" "$recipients"
+}
diff --git a/scripts/install b/scripts/install
index 752f774..3ab3c8a 100644
--- a/scripts/install
+++ b/scripts/install
@@ -30,7 +30,7 @@ ynh_abort_if_errors
 domain=$YNH_APP_ARG_DOMAIN
 path_url="/"
 admin_email=$YNH_APP_ARG_EMAIL
-admin_pass=$YNH_APP_ARG_PASS
+admin_pass=$(ynh_string_random 24)
 port=$YNH_APP_ARG_PORT
 is_public=$YNH_APP_ARG_IS_PUBLIC
 
@@ -59,11 +59,6 @@ ynh_webpath_available $domain $path_url
 # Register (book) web path
 ynh_webpath_register $app $domain $path_url
 
-# Check password strength
-[[ ${#admin_pass} -gt 6 ]] || ynh_die \
-"The password is too weak, it must be longer than 6 characters"
-
-
 #=================================================
 # STORE SETTINGS FROM MANIFEST
 #=================================================
@@ -226,3 +221,17 @@ sudo systemctl start $app
 #=================================================
 
 systemctl reload nginx
+
+#=================================================
+# SEND A README FOR THE ADMIN
+#=================================================
+
+message="PeerTube was successfully installed :)
+
+Please open "https://$domain$path_url"
+
+Here is the admin password: "$admin_pass"
+
+If you facing an issue or want to improve this app, please open a new issue in this project: https://github.com/YunoHost-Apps/peertube_ynh"
+
+ynh_send_readme_to_admin "$message"
diff --git a/scripts/upgrade b/scripts/upgrade
index f2b4dbd..b7009d3 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -40,6 +40,19 @@ elif [ "$is_public" = "No" ]; then
 	is_public=0
 fi
 
+#=================================================
+# BACKUP BEFORE UPGRADE THEN ACTIVE TRAP
+#=================================================
+
+# Backup the current version of the app
+ynh_backup_before_upgrade
+ynh_clean_setup () {
+	# restore it if the upgrade fails
+	ynh_restore_upgradebackup
+}
+# Exit if an error occurs during the execution of the script
+ynh_abort_if_errors
+
 #=================================================
 # REMOVE APP MAIN DIR
 #=================================================