How to hard reset the bluetooth on Sony Walkman NW-WS620 / NW-WS623 / NW-WS625 Earbud earphones if they are not connecting or not pairing or there is only sound out of the left ear or the right ear or you need to troubleshoot other problems, a hard reset to factory default settings can fix a lot of issues. Found in the Sony NW-WS623 user manual.

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