What´s up guys. After trying resetting, aluminum foil, using the plugging technique, etc. without solving the issue and just getting sloppy results (just one side working, connecting via bluetooth but no sound ) I took apart the right side of the headphones, then pushed gently the little metal sheets of the plug. I believe the malfunction was due to wear and bad contact of the cable plug. Anyway, I did that and they are working just fine. Be careful because there are several tiny cables welded to the board and can be broke easily. Hope this helps.
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