DeepBlueMN
2019 AWD Model 3
Why do you think it is in a loop?It never restarts, just remains in a constant loop at 50%
It is quite common now that updates sometimes take about 3 hours to fully process, and these updates follow this same “stuck at 50%” issue. I am not sure if anyone outside of Tesla knows why this is the case, but I certainly consider this a bug, but Tesla seems to have little concern about fixing this widespread issue (since it was introduced earlier in 2022). Personally, I think the issue involves update software decompression, validation, and processing; NOT the actual download itself, which I think is fully complete at the 50% point, regardless what the on-screen messaging states.
Just make sure you have a good wi-fi signal, leave the car alone, and it will most likely finish in a few hours. If you reset the MCU, I think you might just make the problem worse.