I have kind of the same problem. I flashed first with evox , following a guide from Xbox scene. After that it started fragging. I checked the soldering, everything was a-ok, so I accessed the 256K backup and this time used x3 bios (I’m pretty sure it was xecuter 3294, since I have a 1.2). Still the ‘fragging’ thing won’t flash, it shows the yellow progress bar, shuts down, but when turn it back on it takes me to the FlashBios menu again. Plus I can’t access memory bank 0011, I can access them individually (1000, 0100, 0010, etc..), off-off-on-on is the only one a can not access (that’s 0011, it’s the same thing, just in case). So if anyone can, please help me out of this, I would hate to buy another X3 (they don’t come cheap you know J)
BTW: The MS bios boots just fine after I disable X3.