I do apologize for this happening, I know it is frustrating to update and have things go awry. A good practice on beta firmware is to update a single cam and verify things before going further. I will usually choose a non-critical camera to do this first test.
That being said I do apologize to everyone who ran into this issue, and we are working to get this firmware fixed now. Wyze Cam v3 and Wyze Cam v3 Pro firmware are paused, Wyze Cam Pan v3 firmware is still live as it seems to be ok.