diff --git a/manifest.json b/manifest.json
index af6006b..15bfd62 100644
--- a/manifest.json
+++ b/manifest.json
@@ -51,8 +51,8 @@
                 "name": "is_public",
                 "type": "boolean",
                 "help": {
-                    "en": "If enabled, Nextcloud will be accessible by Nextcloud Desktop and by users without a YunoHost account. This can be changed later in the webadmin.",
-                    "fr": "Si cette case est cochée, Nextcloud sera accessible par Nextcloud Desktop et par les utilisateurs n’ayant pas de compte YunoHost. Vous pourrez changer dans la webadmin."
+                    "en": "You need to enable public if you want to connect Nextcloud Desktop client to Nextcloud server. This can be changed later via the webadmin.",
+                    "fr": "Vous devez cocher cette case si vous souhaitez connecter le client Nextcloud Desktop au serveur Nextcloud. Cela peut être modifié ultérieurement via l'administrateur Web."
                 },
                 "default": true
             },
diff --git a/scripts/_ynh_mysql_connect_as.sh b/scripts/_ynh_mysql_connect_as.sh
new file mode 100644
index 0000000..a22963e
--- /dev/null
+++ b/scripts/_ynh_mysql_connect_as.sh
@@ -0,0 +1,36 @@
+#!/bin/bash
+
+# Open a connection as a user
+#
+# example: ynh_mysql_connect_as --user="user" --password="pass" <<< "UPDATE ...;"
+# example: ynh_mysql_connect_as --user="user" --password="pass" --default_character_set="utf8mb4" < /path/to/file.sql
+#
+# usage: ynh_mysql_connect_as --user=user --password=password [--database=database] [--default_character_set=character-set]
+# | arg: -u, --user=                        - the user name to connect as
+# | arg: -p, --password=                    - the user password
+# | arg: -d, --database=                    - the database to connect to
+# | arg: -c, --default_character_set=       - the charset to use
+#
+# Requires YunoHost version 2.2.4 or higher.
+ynh_mysql_connect_as() {
+    # Declare an array to define the options of this helper.
+    local legacy_args=updc
+    local -A args_array=( [u]=user= [p]=password= [d]=database= [c]=default_character_set= )
+    local user
+    local password
+    local database
+    local default_character_set
+    # Manage arguments with getopts
+    ynh_handle_getopts_args "$@"
+    database="${database:-}"
+    default_character_set="${default_character_set:-}"
+
+    if [ -n "$default_character_set" ]
+    then
+        default_character_set="--default-character-set=$default_character_set"
+    else
+        default_character_set="--default-character-set=latin1"
+    fi
+
+    mysql --user="$user" --password="$password" "$default_character_set" --batch "$database"
+}
\ No newline at end of file
diff --git a/scripts/_ynh_mysql_dump_db.sh b/scripts/_ynh_mysql_dump_db.sh
new file mode 100644
index 0000000..3b922bb
--- /dev/null
+++ b/scripts/_ynh_mysql_dump_db.sh
@@ -0,0 +1,37 @@
+#!/bin/bash
+
+# Dump a database
+#
+# example: ynh_mysql_dump_db --database=roundcube --default_character_set="utf8mb4" > ./dump.sql
+#
+# usage: ynh_mysql_dump_db --database=database
+# | arg: -d, --database=                    - the database name to dump
+# | arg: -c, --default_character_set=       - the charset to use
+# | ret: the mysqldump output
+#
+# Requires YunoHost version 2.2.4 or higher.
+ynh_mysql_dump_db() {
+    # Declare an array to define the options of this helper.
+    local legacy_args=dc
+    local -A args_array=( [d]=database= [c]=default_character_set= )
+    local database
+    local default_character_set
+    # Manage arguments with getopts
+    ynh_handle_getopts_args "$@"
+    default_character_set="${default_character_set:-}"
+    MYSQL_ROOT_PWD_FILE=/etc/yunohost/mysql
+
+    if [ -n "$default_character_set" ]
+    then
+        default_character_set="--default-character-set=$default_character_set"
+    else
+        # By default, default character set is "latin1"
+        default_character_set="--default-character-set=latin1"
+    fi
+    
+    if [ -f "$MYSQL_ROOT_PWD_FILE" ]; then
+        mysqldump --user="root" --password="$(cat $MYSQL_ROOT_PWD_FILE)" --single-transaction --skip-dump-date "$default_character_set" "$database"
+    else
+        mysqldump --single-transaction --skip-dump-date "$default_character_set" "$database"
+    fi
+}
\ No newline at end of file
diff --git a/scripts/backup b/scripts/backup
index c94a3d9..cc93817 100755
--- a/scripts/backup
+++ b/scripts/backup
@@ -8,6 +8,7 @@
 
 source ../settings/scripts/_common.sh
 source /usr/share/yunohost/helpers
+source ../settings/scripts/_ynh_mysql_dump_db.sh
 
 #=================================================
 # MANAGE SCRIPT FAILURE
diff --git a/scripts/install b/scripts/install
index ea8f86c..04d15c3 100755
--- a/scripts/install
+++ b/scripts/install
@@ -8,6 +8,7 @@
 
 source _common.sh
 source /usr/share/yunohost/helpers
+source _ynh_mysql_connect_as.sh
 
 #=================================================
 # MANAGE SCRIPT FAILURE
@@ -79,6 +80,9 @@ ynh_app_setting_set --app=$app --key=db_name --value=$db_name
 ynh_psql_test_if_first_run
 ynh_psql_setup_db --db_user=$db_user --db_name=$db_name
 
+ynh_mysql_connect_as --user=$db_user --password="$db_pwd" --database=$db_name \
+    <<< "ALTER DATABASE $db_name CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci;"
+
 #=================================================
 # DOWNLOAD, CHECK AND UNPACK SOURCE
 #=================================================
@@ -191,6 +195,9 @@ exec_occ maintenance:install \
 #=================================================
 ynh_script_progression --message="Configuring Nextcloud..." --weight=8
 
+# Set the mysql.utf8mb4 config to true in config.php
+exec_occ config:system:set mysql.utf8mb4 --type boolean --value="true"
+
 # Ensure that UpdateNotification app is disabled
 exec_occ app:disable updatenotification
 
diff --git a/scripts/restore b/scripts/restore
index cdb18e1..d43cdda 100755
--- a/scripts/restore
+++ b/scripts/restore
@@ -8,6 +8,7 @@
 
 source ../settings/scripts/_common.sh
 source /usr/share/yunohost/helpers
+source ../settings/scripts/_ynh_mysql_connect_as.sh
 
 #=================================================
 # MANAGE SCRIPT FAILURE
diff --git a/scripts/upgrade b/scripts/upgrade
index 42b2a7a..0cea797 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -276,6 +276,15 @@ then
     # Print the current version number of Nextcloud
     exec_occ -V
 
+    if [ "$(exec_occ config:system:get mysql.utf8mb4)" != "true" ]; then
+        db_pwd=$(ynh_app_setting_get --app=$app --key=mysqlpwd)
+        # Change your databases character set and collation
+        ynh_mysql_connect_as --user=$db_user --password="$db_pwd" --database=$db_name \
+        <<< "ALTER DATABASE $db_name CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci;"
+        # Set the mysql.utf8mb4 config to true in config.php
+        exec_occ config:system:set mysql.utf8mb4 --type boolean --value="true"
+        exec_occ maintenance:repair
+    fi
 
     # Upgrade may fail if this app is enabled
     # Take all apps enabled, and check if mail is one of them