Please power the NAS off, and connect a keyboard and monitor to it and go to the BIOS setup.
Change the default USB boot order to the SATA HDD, then save settings and reboot
Please power the NAS off, and connect a keyboard and monitor to it and go to the BIOS setup.
To accurately identify and resolve the issue, please send the TNAS-PC client screenshot and system report via email to our technical support inbox([email protected]), including the forum link and your forum ID.
Sorry. I think I posted this in the wrong thread. It should relate to F2-425Plus. I will repost in the correct thread and you can delete the post here.EriChan wrote: ↑27 Jun 2026, 20:07To accurately identify and resolve the issue, please send the TNAS-PC client screenshot and system report via email to our technical support inbox([email protected]), including the forum link and your forum ID.

I don't think you needed to update the Bios and I'm not sure the Bios would have anything to do with the Tos update failing to work. It may not help, but my experience with my +425 model is not dissimilar: