Corrupt BIOS on Satellite L870-141

Hello,
I have a Satellite L870-141 (PSKBLE). I have updated my BIOS recently to the latest version. (1.60).
Installation was succesfully completed and everything worked fine. After a week or so, the alt key got kind of stuck.
Rebooting the system did not help. Restoring to an earlier backup did not help.
After trying several things, I discovered a way to unlock the tab key. When the sticky keys function is enabled, I have to press the FN key first and than the F5 key. But when I reboot the system, the alt key is stuck again.
It is not a physical stuck alt key, because when I have 'unlocked' it, I can use all the keys again, including the alt keys.
When I access the bios by pressing F2, the bios opens, but I can not use a single key! I have to use the power button to exit the bios. Therefore, I think the bios is corrupt.
Does anyone have a solution for this problem?
Or does anybody know how to downgrade the bios system? (I can not find an official earlier version of the bios)
Note: When I use the HWsetup program and activate the standard F1-F12 function, I can not 'unlock' the tab key anymore.

Problem is that Toshiba offers latest BIOS versions only so on Toshiba download page you will not be able to find earlier BIOS version.
What you can try is to contact nearest Toshiba service provider and ask for help. They have access to BIOS database and can obtain older version for you.
I really dont know what is wrong there but you can try to use older BIOS version in hope everything will be OK.
Have you checked this forum to see if anyone else has reported about the same issue?

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