flash x3 with an x2 bios 4981/4983 on to one of its banks preferably bank 5 becuz 1-4 are taken by x3 bios (1 mb) to flash the bank 5 u'll have to do it througgh cromwell/flashbios but that should have been something u done at first

now once flashd x2 bios, ftp in load that eraser file u got with x3 bios package, rename it to default.xbe launch it with xbmc! (i found it launched with that) and boom x3 bios back on preset settings! have fun