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E51 — BLE_MAC_READ_FAILED

The device's BLE MAC address could not be read from eFuse.

What happens​

The current iteration of bluetooth_loop's inner loop continues — the loop retries immediately. The error is recorded once per boot. BLE scanning and connection attempts continue on the next loop iteration.

Possible causes​

  • The eFuse MAC address could not be converted to the expected 6-byte format. This is extremely unlikely on functioning hardware and may indicate a driver or firmware bug.

How to fix​

  1. Wait / reboot — The loop retries automatically.
  2. Contact support — If this error appears consistently, open an issue on GitHub with your firmware version and device model.