Hydra 120 problem

[KaztheMinotaur]

My Hydra 120 won't communicate with the Castle Link. When I first plug the Castle link in everything is green and I get a pop up saying that there is new device firmware available. When I click OK it starts to read the settings, briefly, and then stops. I then get an error message saying that it didn't get a response from the controller. It says to unplug the USB device and try again but that doesn't help. I try re-connecting the battery but that doesn't help either.

It won't arm with the radio either but I do have power to the servos via the CC BEC.

I ran it for a few minutes on Saturday evening. I later discovered that the battery probably has a bad cell.