As already said, even if I restore the LFRAME cut it won't work.
Edit: I'll now take a look at this xbox if it is even working anymore or I really killed it. First, I'll take out the XBIT chip, reconnect the LFRAME and take a look if it boots. If not, the box is dead.
If it does, I'll rip out a cheap LPC MOD V2 from a working 1.4 box and install that in the 1.6, before that I'll flash a 1.6 compatible BIOS on the LPC mod. If it then works with the chip, the Xbit is dead. If it still won't work, I just need to wait until my Aladin XT chips arrive, they're definitely 1.6 compatible. I will then install the XBIT in the 1.4 console (where I can also observe, whether the chip is dead or not). If it works there, I'll leave it in the 1.4 box, grab another <1.6 box and install the LPC mod there.
Whew. What a hustle.