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flash insyde bios with ch341
#1
Brick 
Hello guys,
I have an HP laptop with a corrupted BIOS (CAPS LED blink 2 times -> BIOS corruption failure ). I don't know what happened to this laptop as it is not mine.
When I read the bios chip with my CH341, it seems completly "crypted".
I there any solution to check if the chip content is correct?

Another request:
Bios chip is w25q32fvsig, it should be a 4M flash and the FD file extract from the exe I found on HP support web site is more than 4M (4 589 056 bytes)
Is it normal?


Model #: 15-af111nf
Bios file from HP is sp80569

Thanks
find
quote
#2
Where I can see completly "crypted" dump?
find
quote
#3
When you open a rom file it usually contains understandable strings.
In that case, nothing, only hex bytes.
http://www.cjoint.com/c/GIyjARopveJ
find
quote
#4
Get 08137.fd fie from sp80569.exe
Decrypt it by hewprsa.exe to 4M-size file.
Write it by CH341A.
find
quote
#5
Great !
Any possibility to retrieve all the info from dump (serial number...)?
find
quote
#6
Where can I find the RSA signature ?
Command line is hewprsa.exe -d bios_in.fd -o bios_out.fd -s out.sig
find
quote
#7
(09-24-2017, 07:47 AM)yakka Wrote: Any possibility to retrieve all the info from dump (serial number...)?
Your dump is almost empty.
(09-24-2017, 09:07 AM)yakka Wrote: Where can I find the RSA signature ?
Use without it:
hewprsa.exe -d bios_in.fd -o bios_out.fd
find
quote
#8
(09-24-2017, 10:10 AM)DeathBringer Wrote:
(09-24-2017, 09:07 AM)yakka Wrote: Where can I find the RSA signature ?
Use without it:
hewprsa.exe -d bios_in.fd -o bios_out.fd

I have a error when I don't put the RSA sig
http://www.cjoint.com/c/GIyqUwBtF5J
find
quote
#9
Try this version.
find
quote
#10
Thanks, file is now 4096 kb!
I'll update the chip next week and keep you update.

Is there any possibility to have fill some parameters I lost (S/N, Windows license...)
find
quote


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