As detailed elsewhere, I did some stupid stuff such that the Gemini wasn't successfully booting, but instead doing a constant cycle of boot attempts and nothing showing on the screen.
That's been taken care of.
However, it appears that somehow in all of that it's stopped detecting the SIM in the card 1 slot. I have taken it out and checked it in my old phone, which I kept hold of just in case of something happening to make the Gemini non-functional... and the SIM works just fine.
I've completely reflashed using the 10 May 2018 firmware, no joy. Going into recovery mode and checking everything it allowed me to check resulted in it saying everything was just fine.
When it gets to the part of setup where it asks you to install the SIM card, and that once it's installed it may take a little to activate? Um, let's say two hours and it still hasn't activated. I've tried removing the card and cycling the system and only reinstalling it during setup, made no difference. Taking the lessons of Windows to heart, I've tried this several times, just in case...
What's bothersome is that it's the same card that it worked fine with previously, and the card still works in my old LG Optimus L70, so it has to be something with device drivers or the Android equivalent, I'd guess; of course, given my record so far in figuring out what's going on, I'm probably way off base on that.
Removing the battery and letting all capacitors drain to insure a complete refresh of hardware detection doesn't seem to be an option, as I haven't a clue how to get at the battery in the first place.
Any suggestions?
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This has been shifted over to
Unknown Baseband / no EMEI (solved) as it is the very same thing, we've determined.