I mentioned the SIM holder too because the SIM card could just work very well in another phone, but be badly inserted in the Pro¹ (if the holder is twisted or something). However, if the SIM immediately shows up every time you flash, then I don't know. I have no second SIM at the moment in my Pro¹ because I use a SD, but I disabled SIM2 in the settings and rebooted, and no issue so far.

My main "isolated" issue is the video thing posted above. :<