I wonder how they got rid of the CMT error.

Anyway, I haven't been able to do anything to get mine working again, and I haven't seen anyone say they have been able to fix this, so I doubt you will be able to, but if you do, I'd certainly be interested in how.

And I don't see how putting a SIM in under pressure will help during flashing, the presence of a SIM shouldn't make any difference while flashing.