[Solved] Calculating AMI BIOS checksum

[me255]

Hello all,

First of all, I hope I'm posting in the right section for this request.

I need to change the MAC address of some PC (because Asus provides 3 motherboards with the same MAC !). I extracted the BIOS and found the MAC inside it. I changed it but when I try to flash it back, AFUDOS tells me "ROM boot block is corrupted" and fail. Do you know how to recalculate the checksum so I can flash the modded BIOS ?

Thank you in advance.

[Mick]

mac addresses are usually unique and are for networking, are you sure its a mac address?

[camiloml]

It's quite strange ASUS manufactured 3 boards with the same MAC Address and all of them end up in your hands Are you sure???

[me255]

Hello and thank you for the answer.

Yes, I'm absolutely 100% sure all the boards have the same MAC address.
(Doing some research on Google shows I'm not alone and it can happen).

[Mick]

Hello and thank you for the answer.

Yes, I'm absolutely 100% sure all the boards have the same MAC address.
(Doing some research on Google shows I'm not alone and it can happen).

http://www.technitium.com/tmac/index.html

why not just spoof the mac?

[me255]

why not just spoof the mac?

Because PXE and Ghostcast can't handle that

[camiloml]

Why don't simply patch AFUDOS to avoid that error and continue flashing???

[me255]

Why don't simply patch AFUDOS to avoid that error and continue flashing???

That would be a good solution Do you know the bytes to be changed ?
I'm currently trying to trace that with TurboDebugger...

EDIT: I patched AFUDOS (Asus version as AMI version is not compatible with Asus boards) but unfortunately AFUDOS do not update networking code

[camiloml]

And the Engineering edition??? Try it, locate in my shared folder.

Look this tutorial,

http://www.bios-mods.com/forum/Thread-AM...AFUDOS-EXE

AFUDOS has swith to change mac in boot block

[me255]

Hello,

And the Engineering edition??? Try it, locate in my shared folder.

There is only one byte changed between this one and Asus-provided AFUDOS. "/M" option is not available in the so-called "Engineering edition".