yea, in almost all of the situations you can flash the bios back, i once tried flashing 9700pro to 9600NP(mistaken, took the 9550 flash diskette instead of the 9700pro flash diskette) and still i chould flash after that the 9700pro back to his old bios, and it worked just fine after that..., it almost cant be that you wont have a boot after flashing this R480 to R430 X800's Bios...