Your mileage may vary, but you could enroll in the beta program and upgrade to the beta firmware if you’re feeling frisky.
There’s also a beta firmware here that adds RTSP. It is probably broken in other ways but if it gets a previously dead camera booting up again it’s worth it.
In my particular case, the RTSP beta firmware didn’t work either. I ultimately packed up the reject v3 and exchanged it for another at my local retailer.
I went ahead and enrolled in the beta program on both of my cameras. Fingers crossed they don’t suffer the same fate as the departed camera.