[Request] AM3 support for ECS RS485M-M

[Vlad94]

Hi! I have a ECS RS485M-M board with only AM2 CPUs support like Athlon 64 X2. I want to add AM3 CPUs support like for example Athlon II X4 640.
I know, adding AM2+/AM3 support to AM2 bios is impossible, but I tried crossflashing to see if I can find any bios that boots on this board.
To my surprise bios from the ASRock ALiveXFire-eSATA2 boots despite being for different chipset! (ATi RD480 + SB600 on ASRock, ATi RS485 + SB460 on ECS).
Sadly, after trying to boot from hard drive (or anything else) it shows message "You are using wrong BIOS. This BIOS is only for SB600 based boards only".
So the question is it is possible to bypass that check to force SB600 bios work on SB460 board?

Thanks!

In attachments i'm adding bios from ASRock and photos from bios and error message.