Going through the same process with one of my 3 V3 cams. I also have an original Wyze cam and Wyze Cam Outdoor. Other cams are working fine, other than the code 90 error on the two (that are currently working) which was fixed a week ago by power cycling.
Nothing seems to work with this third one, which had been working fine until recently. My last attempt was to follow the instructions to flash the most current firmware after downloading it to a USB card from my PC. That did not help. I could get through all the setup steps just fine…but the camera couldn’t wouldn’t connect to wifi.