So, since I have only N9 Service Manual, and not an N950 Service Manual, are these screws TorxPlus4 or TorxPlus5? Can I reuse them, or should I replace them with new screws just to be on the safe side?
Is it better to use Torx or TorxPlus screwdriver? Torx screwdriver would have loose fit with TorxPlus screw, but it's not like large torque is needed.
The most detailed photograph of the slot from outside I could take was already provided (yes, it's the original resolution, just cropped from a larger photograph): .
Will post the photographs of the inside when I get the proper screwdriver(s).
For now, it's expected that any soldering will be done only on useless SIM cards (there are two or three of them), not on the SIM port itself - just to confirm that the solder alloy conducts current and fixes the problem.