Without any additional information, all I can suggest is that the customer download and install the latest BIOS upgrade from the corporate Web site:
O.K. Forgive me, but you don't seem to have indicated exactly what manner of problem you are having with your BIOS. In general, you can't go wrong by installing the latest BIOS. After all, how old can a tablet computer be?!
The Fujitsu ST5112 BIOS features a "boot password" and a "master password." If you forgot the boot password ***** remember the master password, then press F2 immediately after booting. Navigate to the BIOS setup screen.
TRY to login using one of the following "secret, undocumented" passwords that the vendor supports:
If (a) you have forgotten the master password [which enables you to change the boot password] and (b) none of these three "default" passwords works, then you are out of luck.
Not COMPLETELY out of luck: you must purchase a fresh BIOS from the manufacturer (Phoenix, I think, but Fujitsu should be able to provide one).
Suggestion: try not to forget vital passwords. Write them on a paper that you keep in a safety deposit box at the bank.