Ya i already tried barak
When i changed that nvs file id into 00:00:00:00:00:00 via calibrator command.it could be changed to that 00:00:00:00:00:00 from the previous one.when i reboot again to see the terminal via ifconfig -a it will be the same 00:00:00:00:00:00 nothing will be changed.
Any other suggestions??