error message -90,

I bought 5 wyzecam v2 last month, after installation, three works fine. but 2 of them have error message ask me power cycle -90,

I have tried to change cable, power adaptor, push the reset (setup) button. one cam no light come out at back. It seems the cam is dead.

another one have solid yellow light all the time. push setup button has no voice. Any hints?

You will need to file a support ticket for this.