I am in the exact same boat as you. I decided to setup 2 v2 cams that I had lying around that we never opened. After setting up the first one, the android app recommended that I upgrade firmware from 4.9.2.25 to 4.9.9.2351. I let the app perform the upgrade, but that turned out to be a huge mistake because it bricked the unit. Now the device is stuck with a solid yellow light and occasional clicking noises.
I tried to recover the unit by flashing older versions of firmware via SD card. Any firmware newer than 4.9.6.x gives me a solid yellow light. Versions at or older than 4.9.5.115 seem to install ok, but I get stuck at the perpetual flashing blue and yellow lights after the cam boots up. The setup button doesn’t seem to do anything. I get no audio prompts when I press it. The camera does have some signs of life though. I see new mp4 files being written to the sd card, along with .txt files that contain gibberish.
My hunch is that the wifi config is corrupt. I tried to do a “factory reset” by holding the setup button for 5-10 seconds, but that doesn’t do anything either. The button is totally dead, except when I use it to flash firmware from the sd card.
Since I am ready to throw these pieces of junk in the river, I decided to see if I could upgrade the second working device from SD card, starting with the oldest firmware versions I can find on the wayback machine. I have successfully upgraded from 4.9.2.25 to 4.9.2.42, then to 4.9.2.52, and finally to 4.9.3.64. I stopped at that point.
The moral of the story is don’t let the wyze app upgrade your camera.
H