Thanks for the reply! I am quite certain that when I flashed it for the xbox I took it out of, I kept Flashbios on the remaining bank. I had intended to boot to that one, and flip the switch, and flash with the appropriate 1.6 bios.
I can't seem to get the thing to NOT frag at this point. I was out of solder braid up till a day or so ago, so until now I had just been reflowing the solder at the points of the rebuild pcb. the contacts look good, but I think I'll try just using wires. those little pads/vias are tiny tho.
Tried every combo of desoldering d0, leaving it grounded, bridging BT with that pin (6 or 9, i can't remember, don't have a diagram in front of me), etc. and still couldn't get the thing to do anything else but frag, even with the eject button attempting to get to the MS dash.
if I take the thing all the way out it SHOULD be like normal, but I'm afraid something else is wrong cuz I desoldered d0 and still coulndt get it to boot like normal. Is that the expected behavior?