Nokia BH-215 hard reset
To repair and reset your Nokia BH-215 :
Clear settings or reset
To delete the pairings from the headset, press and hold the power key and the answer/end key (for about 5 seconds) until the red and green indicator lights start to alternate. To reset the headset if it stops functioning, even though it is charged, connect the headset to a charger while you press and hold the answer/ end key.