I show you how to factory reset (hard reset) a pair of Sony WH-CH520 Wireless Headphones Bluetooth On-Ear Headset (geni.us/nFvR1). You do this if you have issues connecting, pairing, one side not working etc. Also note after factory reset and you want to pair back to device that was paired before you must first delete, forget, or unpair these headphones from the paired list first or it won't find it even if in pairing mode. I hope this helps.
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