Menu → System → Factory Reset → Enter 0617 → Confirm.
Press to cycle through the fields you want to change: Seconds → Minutes → Hours → Day → Month → Day of the week . Press D to increment the value of the flashing field. Nako Na-617a User Manual
Follow these steps to begin using your Nako Na-617a for the first time. Menu → System → Factory Reset → Enter 0617 → Confirm