Actually my fone is poco X2 but that is not in your list...so my front and back camera is not working and yes flash is also not working... suggest some solution
You can go and mobile service store. it's problem processor problem. the technician processor cleaning and washing. then again fitting. after your mobile all problem fixed.
Mon caméra selfie poco M3 ne fonctionne pas
由 Mohamed Bachir 完成的
Poco x2 rear camera not working
由 Sushil Singh 完成的