Question about Sony Xdr-C1dbp

According to chatGPT
❓ Code "ErrU56

This code does not appear in the official Sony manual.
It may indicate:
1. display bug or incorrect display of another message.
2. low or empty back-up battery ("" icon normally provided).
3 Software problem or fault.

⸻

🔧 Steps to try
1. simple reset:
- Disconnect the alarm clock from the mains.
- Remove the CR2032 battery.
- Wait at least 30 seconds.
- Replace the battery and reconnect.
2 Replace the CR2032 battery with a new one, even if the old one seems to be fine.
3) Factory reset (via the alarm clock menu) to clear any software errors.
4) Observe when ErrU56 appears: at start-up, during a setting, or after a power cut.
5. contact Sony support if the message recurs after these steps.