That happens sometimes, not often but sometimes. The only option is to try and reflash the firmware. Can you access the web GUI or PC Pro? If not, you can flash with an SD card. If that fails, you're probably out of luck. Hopefully it's under warranty still.
Does anyone have an idea for homes that can't possibly rewire? I do a fair number of big houses and apartments. Some even have old quad wiring especially at doors. In my own house, I have an NEC door phone connected to old door bell wire.
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