Just an FYI I upgraded my TerraMaster FS-420 from DSM_DS918+_25426 to DSM_DS918+_25426 update 2, I made a backup of the settings just in case. I use what I call my "TerraXpen NAS" as a backup device for my real Synology NAS. I mention this only because I knew if I lost everything I could start from the beginning and recreate the backups I already had. I downloaded the update closed my eyes (Just kidding How would I know if I was really clicking the correct button with my eyes closed.) The system did its thing after about only 3 minutes the system rebooted, I checked what version was installed and I was glad to see DSM_DS918+_25426 update 2. I confirmed I still had automatic updates was turned off in case the update reset things to automatic updates. and I am assuming all is well.