Try flashing the bios again and remove all hard drives before booting up. There are known old virus/worms that can write to bios on older unprotected boards.
If still gets corrupted then it a board issue... just a quick thought.

Try using a chip programmer. If that doesn’t work, replace the chip.

I will try tomorrow to flash the rom with flash rom. Thank you.

Have you replaced the capacitors? Both Soyo boards I have had failing capacitors. I just checked on Ebay, and the one listing I saw for a 6ZE+ has some obviously bulging caps.

Hello there, I bought a new bios chip and even though it is written mx 28f2000,it is recognised as 28f010.i believe it is a China fake chip where I can only write 128kb.i tried to program a w49c but writing fails. Does the chip kb arrangement is specific to the mx28f2000 only? Which chip is a direct replacement? The caps looks okey. The original chip was placed 180degreea differently and it got super hot yet it is recognised, uniflash programmes it okey yet award 535a fails to write it. The bios chip after uniflash programming only enters me in boot block mode. Any thoughts?

So which bios chip is a direct replacement?