Corrupted Bios Toshiba Satellite Pro A50-C (PS56AN-0KD01H)

[Wachenanggo]

The first main issue for this one is that the SSD is read but can’t load Windows OS i tried to reinstall the OS but nothing happened then i wanna try to reflash the bios but i maybe manage to bricked the backup since if i reflash it again back i got no cpu activity and no image. can somebody help me find or rebuild the old bios file?? i looked everywhere i can find one
BACKUP.rar (3.4 MB) here is the backuped bios
bios_v660.rar (5.2 MB) bios update that i found on the internet

maybe ME region is messed up??

i run me analyzer it reports back Error: Invalid ME 10.0 RSA Signature!

[lfb6]

Maybe ME should get cleaning, but bios region is corrupt, too. How did you do this backup? If done with a programmer, did you get two 100% identical reads?

See error messages and structure of first EFI volume in bios region

[Wachenanggo]

BACKUP UPDATES 6.6.rar (3.4 MB)
this is my attempt to update bios using the bios from toshiba’s websites

can you rebuild it or clean ME?? this??

[lfb6]

@lfb6

How did you do this backup? If done with a programmer, did you get two 100% identical reads?

And please describe the steps to rebuild this bios

[Wachenanggo]

i use CH341 Programmer i trusted the first bios read . i’m newbie. i really don’t have idea how to rebuild bios.

[Wachenanggo]

i just copy
bios_v660.rar (5.2 MB) content to
BACKUP.rar (3.4 MB)

the output file is
BACKUP UPDATES 6.6.rar (3.4 MB)

can you help??

[lfb6]

I’d think this NVRAM you put in there won’t work, you’d need some defaults at least.

I don’t think that the ME would keep the system from booting, but it’d be necessary to clean it anyway. Follow this guide to the letter:

[Guide] Clean Dumped Intel Engine (CS)ME/(CS)TXE Regions with Data Initialization

Guide-How To: Clean Dumped Intel Engine (CS)ME/(CS)TXE Regions with Data Initialization Last Updated: 2020-07-22 This guide is relevant to those who need to clean the DATA section of an Engine (CSME, ME, CSTXE, TXE) Region, which is part of a dumped SPI/BIOS image, in order to flash the latter on a different machine of the same OEM model. It is not meant as a guide on how to completely transform a dumped Engine region into a stock Intel-provided one. Although the guide can be used for that some…

[Wachenanggo]

how can i make it work?? not familiar with NVRAM. no idea on how to do it. regarding the ME region i think i can’t do it right without messing up the Bios CHIP if i try it multiple times it would destroy the chip. can you do it?? PLS???