Please elaborate on how are you trying to program the new bios. There are many combinations. What techniques, equipment, software and what chip are you using.

Edit: what bios file are you programming? What error are you getting?

There are two jumpers on the PVI-486SP3 motherboard that must be enabled in order to program the flash ROM - JP32 & JP33.
Makes sure that both are in the 1-2 position. You can also refer to the manual for more guidance.

However, what could also be a problem is that you have an older chipset revision (the A4 revision). The newer BIOS versions are not compatible with the older chipset revision.
Refer this page: https://theretroweb.com/motherboards/s/asus-p … 86sp3#downloads and the "BIOS Info" document.
As well as: https://web.archive.org/web/20210804181206/ht … pvisp3-004.html

I have a Willem V5 running off Win XP. I get buffer errors trying to write or erase. I can clear buffer and skip 0xff and still get errors. Erase gives 0x0000000 error. The one i have been able to write and verify is no good, not even beep codes. I original chip was broken so i cant flash on board.