uOPT,
"...decisive thing here that makes you able to go backwards? That you rename the file? Or that you use AFUDOS 2.11?..."

AFUDOS 2.11/2.17 does not seem to have "revision check" as later DOS flashers.
- there are some sensitivities between BIOS'es CPUs/OS/features, which may be the reason later flashers discourage backward flashing.
- examples: [1707 + JMicron ROM + Vista SpeedStep]; [2004 + Enhance memory compatibility]; [1602 + Enhance HDD compatibility]
- see P5WDH BIOS section for more details: http://support.asus.com/download/dow...Language=en-us
- renaming target BIOS to "p5wdh.rom" is the default filename "CrashFree" process looks for, on floppy or USB drive.

Have been lucky and have not had problems with new BIOS'es, including latest 2205.
- have tested BIOS reverting, all the way back from FEB, 2007.
- ref: http://www.xtremesystems.org/forums/...postcount=3823