To perform a system reset on Halo Sport 1, press and hold the power button on the right earcup. The indicator light will fade, then start to blink again. Continue holding the power button until the indicator lights turns off again. This should take 15-20 seconds.
Wait 10 seconds and press the power button to turn the headset back on. The indicator light will blink green indicating the device is powered on.
Check out this video for a walkthrough of how to reset your Halo Sport:
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