Hmmm... this stuff refers to PCB versions 1.03 and 1.04, used on the A-1.5 and A-2 production badges- but still you should replace the EPROM chip on those PCB's (dunno with which flashable one) to do the job.
Dunno any flashEPROM suitable for Asus drives (Asus should know better, of course), but mine actually wasn't one of those two badges...
You may pull out your Asus, unscrew the top and check the PCB version- so in the case it was one of them you could try to find a FlashEPROM to fit on the PCB. But IMO at the current CD-ROM and DVD-ROM prices it's not worth the effort.
Without the EPROM mod you cannot flash anything to it.