@ikoz Many thanks for the work. I have them both on Xenial at the moment. I don't have the skillset to further these devices unfortunately.
As for the IMEI disappearing, I assumed (never assume) that something like that was the case, so no panic.
I don't know why my installs didn't quite go to plan, but figuring it out and then seeing UT running made it worthwhile.
I am a big fan of the OP devices, quality hardware and a pretty straightforward install the vast majority of the time and I would personally award them a medal for making the bootloader not a chore to unlock!