[REQUEST] Lenovo Z40-75 & Z50-75 (A4CNxxWW) Whitelist Removal

[BDMaster]

Your CPU is an AMD and I cannot rewrite back the Bios Mod !
Only using an SPI Programmer with Clip is possible to make this job !
Look here :

https://www.bios-mods.com/forum/Thread-R...5#pid74575

let me know
Regards

[adde88]

So a BIOS modification would not work for me at all?
The only solution is a programmer?

I've been looking through the BIOS all day with IDA, trying to find the whitelist.
The only interesting thing i've found is a module named: SystemErrorLogPei
It contains several strings that i'm trying to figure out what means:
"1000101010001010100010000"
"100010100010100010000"

They might just be references to some offsets, i'm not that used to assembly.
One offset is named: off_FFFA8DEC
Also the function: "sub_FFFA8F53" has 11 sub-routines it can go to.

That's just the things i've "found" so forth.

Anyway. I'll try to locate a programmer asap. Thanks for your help! Much appreciated!

[BDMaster]

Give a look to FalseClock Method too :

https://www.bios-mods.com/forum/Thread-R...-EFI-shell

You can unlock some Variables into VarStore !
Let me know
Reagrds

[adde88]

My CH341A programmer finally arrived in the mail today! Yeeey!
So how do i proceed now to get this whitelist problem fixed?

[BDMaster]

Ok friend,
here HMM :

https://download.lenovo.com/consumer/mob...es_hmm.pdf

Here Schematics :


You have to find the Chipset ENE and near It You will find the Eeprom Chip

http://www.ebay.com/itm/New-102500720-Le...1846630702

Look on left side bottom . . .and You will see two 8 pins soic8 chips !
Then You have to check the serigraphy and write to me the name on !
Let me know
Regards

[adde88]

Here's my motherboard.
The soic8 chip with the red ring around it, is a Winbond chip: Serial:25Q64FVSIG
This is the only Winbond chip i could locate on the motherboard.
I'm guessing it's the right chip, as Google says it's a 64Mbit SPI flash chip, and my BIOS is 8MB (64Mb). Am i correct?

EDIT:NB! The serial number i posted was wrong, i have updated the post to show the real number!

[BDMaster]

Yes !

[adde88]

Sorry for using such a long time, but i had to connect my chip to the programmer without the clips!
But i finally managed it! 

Here is the BIOS image from the programmer: https://www.sendspace.com/file/rnj3mq

I used an English version of the CH341A programmer, and it worked great!
I'm actually quite impressed i managed to do this, without any issues at all!
Btw, i ran a checksum on this image from the programmer, and compared it with the normal bios dump, and it differed.
I'm guessing it's supposed to differ, right?

[BDMaster]

Try this one :

http://rghost.net/92B9QLMcy

Let me know
Regards

[adde88]

I successfully wrote your imagefile. But still got the same error: unauthorized device. :/