(UEFI) Dell XPS 15z L511z modded BIOS - and HOWTO

[jkbuha]

Thanks a lot
The checksum inside the vbios module could be easily modified as i mentioned in my previous replt .
you just knew the location of the checksum bit inside the module .
Then normally modify the module .
After finished modifying , check the new checksum using hexeditor or chk8 tool .
Replace the old checksm bit with the new one you get from the tool .

And andys tool adjust the other checksum .
You can now easily modify any vbios

Thank you , good luck in your doctorate
Ahmed

That's great - thanks for the helpful advice and the well wishes!

I've found a tool called NiBiTor (Nvidia BIOS Editor) which apparently does all we need including changing the correct checksum. So kasar - if you need to overvolt your board all you need to do in theory is change hex 5f (the default voltage = 0.95V) to a higher value, calculate the new checksum with NiBiTor and modify the final byte of the file accordingly. Let me know if you have any success in this - otherwise when I get back to my laptop I'll compile a full L502x BIOS with new GPU for you to try out

With this done we should be able to do everything we want with the Nvidia Video BIOS. Next step is to unlock our hidden settings.

Cheers
jkbuha