Updating bios safe

The bios isn't removable, so surely there's some kind of device they plug into to reflash it for you I thought. Next to the BIOS chip, to the left of the south bridge, is an undocumented 7 pin connector labeled SPI_J1.

After a lot research I stumbled upon a few pages (linked at the bottom) that documented the type of cable necessary and the software to use this port to reflash the bios.

updating bios safe-62

This didn't work out well so I found at the local electronics store a parallel connector with a ribbon cable on it.

I took it apart and re-soldered the ribbon to the correct pins.

To get the ~3V, I took a pass through power connector from an old case fan and added three diodes to the 5V wire, giving me a little over 3V.

It was able to erase the BIOS without problems, but failed to write the new BIOS.

i knew that when i next rebooted the computer: it would be a brick. But before i rebooted i transferred the bios backup, the new bios, and Asus DOS-based flash utility to another computer. This Asus motherboard has a fail-safe bios recovery called This Asus motherboard has a fail-safe bios recovery called Crash Free BIOS, where you put in a floppy or USB stick containing a file called p5and it will restore the bios from that file. It doesn’t do it automatically (it would be ludicrous to have the floppy drive read on every boot).

To run the built-in BIOS flashing tool, you have press WARNING: Never use the ASUS Windows based bios flash utility.

There have been scores of people with the same issue, if only I had known before hand. In perhaps a moment of great stupidity and laziness, I reflashed the bios on my ASUS P5B Deluxe using the ASUS windows based flash utility.

It wiped it clean, loaded the new one, and then it couldn't verify.

At this point your only two options are quit or retry.

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