Hello
I messed up my bios on hp elitebook 820 G3
There are two bios chip I read mx25l12873f like Mx25l12805d and get bios dump that seems to be valid After changing some data and write back I get corrupted bios.
Do I have to read write booth bios chips because I edited only one?
Can someone upload dump for booth bios chip?

can you upload your dumps here

Yes later today will upload dump that I read form one bios chip


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how you reading bios chips ? via programmer ?

Yes ch341a

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https://drive.google.com/file/d/0B1wDK6 ... p=drivesdk

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With an attached dump whether there is an image on the screen ?

I get logo one time and after that only restart by itself and fan spinning fast.
Will try later today to read chip again and compare with dump and after that erase and write original dump.
Can be a problem this model have two bios chip?

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I'm uploaded new dumps on the google drive HERE

Thanks will try as soon I get home from work

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can you send feedback about result here

The file don't work.
If someone have another please upload
Thanks

you had tested three files ?
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may be problem with programmer ?

Yes and pc don't start with that files, if I look in hex view files are completely different.
Try to compare with my upload there are big differences.

try this

On 0016DE10 are stored serial and on this dump are not on that address

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on 0x3000 - 0x6ffff0 is ME(Intel Management Engine Firmware) region ,
I've had replaced it on a clean ME (no data , no serial, no ID)

Ok will try tonight when I come home
Thanks

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Work in progress (I damage one pin on the board need to fix that to)



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Write done successfully



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Bad news
After trying all files that I get no success.
As soon I put battery back power button start blinking rapidly and can even try posted power on the machine.
I try to change only one number in original dump and machine starts about 20 second and then begin to restart every 10 seconds without any picture on screen.
It's looks like there are some checksum test as soon I put the battery or need to flash another chip that are on the board mx25l64....
For now i quit because I destroyed some print on the board an make a bridge with wire so I wait till someone have original backup or make successful writing on another machine.
Thanks guy's for all help.
I'm not done still waiting for solution

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Upload you dump and I will make file for flashing bios that can reset password
The file can't be used file from one to another machine right now I don't know right reason for that but important thing are that solution works
Tested on elitebook 820 G3

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This file remove bios password on my machine