Hello, I'm looking for a modified BIOS that is described in this article.
https://www.dosdays.co.uk/topics/review_pcchips_m590_pt1.php

"unofficial patch from Jens Steuenbrink which is "06/25/1999S" with his patch called "J.2 01/06/2004". This adds support for the AMD K6-2+ and K6-III+ CPUs by fooling the chipset into thinking there's a K6-III (non-plus) in there, including the on-die L2 cache and the Write-Allocation and Write-Combining features. The USB support bug that hampered many of the PC Chips BIOS revisions has also been fixed in this patch."

Does anyone have access to it?

I have the exact same board (false 100MHz 😁 ) and I also have AMD K6-2 500 MHz and I want to run it on this board.