@Brux There seems to have been a software update that wiped out a fair few of the C200 cameras as well.

I returned two other tappo cameras ( unopened and not used) back to the shop as my C200 has been bricked by TP link , and TP link supports response to this is " Apologize for any inconvience caused, and we can only suggest you purchase a new one on our authorized resellers. "

 The odd thing was I was not the only one in there returning TP link cameras and according to the shop assistant quite a few of these tapo things have been returned lately as faulty.

 and yet all support say is

" Apologize for any inconvience caused, and we can only suggest you purchase a new one on our authorized resellers. "

  @Brux  Hi, I see the C420's new firmware is releasing on Dec 26, the problem may not caused by firmware updates: https://www.tp-link.com/en/support/download/tapo-c420/v1/#Firmware-Release-Notes. My understanding of your problem is the camera is online but you can't see its live view or recordings, if so, you can try to reboot the camera via the Tapo app or watch the camera with a different phone.