Firmware updating is always a headache for all brands of smartphones, stock firmware is always the best, or else you will be doing multiple factory resets.
Is it just hot? Or is there any other harm because of overheating, like hardware fault or screen failure?
I don't mind if it just gets hot (my Sony Z got really really hot, but didn't produce any faults)
My question is why these companies can't do a real life test on their phones before launching?