Nokia BH-904 hard reset
To repair and reset your Nokia BH-904 :
Clear settings or reset
To clear all the pairing settings from the headset, switch off the headset, and press and hold the power key and
the answer/end key at the same time for about 5 seconds. The headset beeps twice, and the red and green
indicator lights alternate. After the settings are cleared, the headset enters pairing mode.
To reset the headset if it stops functioning, even though it is charged, connect the headset to a charger, and
press the power key and the answer/ end key at the same time.