Exracting a bios .rom from a Toshiba bios update

Only for programmers and BIOS gurus with technical questions.
Post Reply
New visitors - please read the rules.
Posts: 1
Joined: Mon Apr 02, 2018 12:00 am

Dear reader,
I have been experiencing some BIOS problems with my laptop since I had bought it 5 years ago. Some of these problems include: grub not appearing unless windows is HIBERNATED. Veracrypt not being able to show a decryption password on boot. Only 20% of live USB’s work. And the problems go on. I have fully erased the SSD ( dd if=/dev/zero ) and these problems still remain.
I have determined that this is most likely a BIOS problem, and I just have a buggy BIOS, and I would like to attempt to debug it.
I have downloaded and extracted the .exe from Toshiba’s website and I have found the BIOS resides in a file called BIO0089T.COM (find here )
However, looking at the hexcode, this looks like no executable that I have ever seen (far too much entropy, but still strings of 0xffffffff (so not ecrypted or compressed, but still has too much to be normal).
So the juicy question: how do I either further extract (decompress / decrypt / etc ) it, or is this the BIOS itself and I am just dumb?
Laptop: Toshiba KIRABOOK PSU7FA-00U00K
The Hardware Archivist
Posts: 6286
Joined: Wed Mar 20, 2002 7:11 pm
Location: Netherlands

I see a newer bios was released after your post (at 30 oct 2018).
https://support.toshiba.com/support/mod ... 83&osId=26

However I'm not enirely sure this will fix all of your issues since Toshiba has decided to NOT support anything but Windows on these machines.

Do not assume anything

System error, strike any user to continue...
Post Reply