Analysing MSI's .ocb files.

[Levent]

Hi, long story short I killed 2 3570Ks in a row and got stuck with a G1610. However when I booted the system with G1610 my previous overclock was still applied and CPU was running at 4.5ghz on both cores, during diagnosing other issues with the motherboard I had to clear cmos and now I am not able to change multiplier to 45 again. BIOS would show multiplier set at 45.

I dumped 3 different .ocb profiles from bios and using binwalk I managed to isolate bits changed between them, however changing values in according to changes between all three files would result in BIOS claiming file is damaged.

Changes in offset 070 is the multiplier, hex 18 is 24 in decimal values, 19 is 25 and so on. I also changed values at 000 accordingly to 32 and 0DC0 to 22 also throws error code at bios.

 

Any ideas? 

[badreg]

There's probably a checksum somewhere in the file. Look for other differences and try to reverse engineer how the checksum works.