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E71 — NVS_BONDING_KEY_WRITE_FAILED

Writing the BLE bond keys to NVS failed.

What happens​

The error is logged and the function returns. The bond is active in RAM for the current session — the FKMTime Display will keep working until the device reboots. After a reboot, the bond is lost and the devices will need to re-pair.

Possible causes​

  • The NVS partition is full.
  • A flash write error.

How to fix​

  1. Re-pair after the next reboot — If the bond is lost on reboot, go to the BLE pairing menu and pair again. The new pairing attempt may write successfully if NVS space has been freed.
  2. Erase NVS and reflash — If NVS writes consistently fail, perform a full flash erase and reflash.
  3. Contact support — Open an issue on GitHub if this appears consistently.