Error codes

FE504510 · FE504511 · FE504512

Usually a phone ↔ watch connection snarl rather than a dead brick.

Try this order

1. Restart the Pebble (hold Back ~10 seconds).
2. Restart the phone.
3. Confirm Bluetooth is on and the watch is in range.
4. Forget the Pebble in Bluetooth settings, then re-pair from the companion app.
5. Reinstall the Pebble / Core app if pairing still fails.
6. Last resort: factory reset the watch (you will re-download apps).