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E70 — NVS_SAVED_STATE_WRITE_FAILED

Writing the device's saved state to NVS failed.

What happens​

The error is logged once per boot and the caller continues. The in-memory state is unaffected — the device keeps running normally. However, the state that should have been persisted (e.g., current session, competitor info) will not survive a reboot.

Possible causes​

  • The NVS partition is full.
  • A flash write error (worn cell, brief power interruption during write).

How to fix​

  1. Reboot the device — A fresh boot retries.
  2. Erase NVS and reflash — If NVS is consistently failing to write, perform a full flash erase (espflash erase-flash) and reflash. All stored settings will be lost.
  3. Contact support — Open an issue on GitHub if this appears consistently.