I have a 386 SBC system that behaved exactly like that. I had to do battery mod, because it "forgot" all settings including floppy type after saving and reboot. So it was unusable.

I would remove the EPROM and read its contents. This could reveal some information.

I came a bit late when the link for the attachment was deleted already, but managed to find it somewhere else, so I could look at it. Wow, a lot of work is behind this. Some of the utilities I did not know until now. I already created my own resurrection floppy based on it, by only replacing some …

After years of lurking around I finally decided to register and post something, let me start with this not so ordinary PC https://www.vogons.org/download/file.php?mode=view&id=186037 Current spec is: AMD 486DX4/100MHz 32MB RAM 1GB CF Card instead of the original 2.5" HDD Cirrus Logic 1MB VGA card, …