1F2108 code is when the DME appears not to match the engine variant or vice versa. I think some f##k up has occured by your tuner!
If your tuner is using ecutek or any other mapping software via the OBD port then your DME is not locked for tuning of course, regardless of age.
Ecutek is great software by the way. Ista+ is BMW workshop diagnostic PC software. This gives much better diagnostic information than carly etc. I'm suprised yout tuner does not have this already, or at least some other quality diagnostic equipment?
Dont worry about the interior light fault, that is irrelevant.
I had a similar DME software version fault before when mapping failed with BM3, but mine didn't give a drive train malfunction, it was just logged in the DME. I had to reflash stock and back to my stage 2 then it cleared.
You might want to re-post this in the DME / tuning section and maybe reach out to forum member "Enabled" on here, he really knows his stuff.
https://f87.bimmerpost.com/forums/fo...play.php?f=722