@Jerome24 Are you able to post the server logs from your server instance? I don’t think there’s any reason to downgrade from one version of 5.6 to another; there are some changes to the default configuration for MySQL 5.7 vs 5.6, which can be adjusted in the mysql.cnf file, but downgrading that is sometimes easier; on the other hand, the error messages displayed in the UI aren’t really helpful on their own.