Hi. Have you got a solution to this yet? I have had the same roblem with my M4 for nearly a year. I've tried soft resets, hard resets, complete firmware re-flashes using Companion app, the service formatting tools, and all sorts, but it simply hasn't worked. Recently I broke my screen, but that's not the cause, as until then it was extremely well treated.
Sony may claim that it's not a know error, but the number of people with this problem on th M4 and M5, it seems that there must be a serious problem, and surely most people are getting it resolved somehow (unlike me, who has livd with the problem for a year since it randomly started, probably after an app update.
Would be great to know how people have solved it, and if we are collectively any closer to working out what the problem actually is.
Thanks
P.S. Have even tried booting into Safe Mode, and the camera still won't work. I cant say that I'm at all impressed with this phone. Between the charging problems I first experienced, the mixed quality sony representatives and responses, and a phone that has severe memory shortage, and can't use the SD card for storing apps without using tweaks and hacks. So clearly, the phone has a few serious issues, and not having my phone camera working for a year is just one of them. I'm just one person, so how much does Sony care about sorting out client problems? I guess the lack of response to all the posts worldwide about this problem for the last year and more are just a reflection of how Sony's focus is not on customer satisfaction through issue resolution and avoidance, but instead through new product releases promising improvements, whether realistic or not.
