Hi guys! Just wanted to share my experiencie as many people had the same problem. I'm from Uruguay and got my X4 las july in Sao Paulo airport during a trip. One good day they didnt turn on cause they were out of battery, put them to charge and the led light turned on green as if it was, but well, let them charging with the hope of the charging buut I got not response from them at all, not turning on, no nothing! I contacted support for help, told AND DESCRIBED EXACTLY the prboblem and basically they sent me 3 emails saying "have you tried turning them on and off?", yeah man, IF THEY TURNED ON I WOULDNT BE ASKING FOR HELP! So what I did? looked on YouTube and saw a video of a dude repairing them, so I caught a sharp knife and opened them, I didnt had nothing to lose as support was useless. The dude in the video had the battery wasted and changed it, but I didnt, I noticed there was an small burnt area, I used a needle, contact cleaner and a swab to get rid of the very tiny burnt spot (no cable was melted or the weld demaged), the thing is that now THEY WORK! Maybe you still have hope to repair them if the battery didnt burnt. ADVICE: DON'T USE THEM IF YOU SWEAT A LOT AND ONLY CHARGE THEM IN THE BLUE USB PORT OF YOUR LAPTOP, AND DONT LET THEM CHARGING FOR MORE THAN 2 HOURS. Other usb ports like cell chargers, car, etc literally toast them, are incredibly DELICATE earphones, but the sound quality still blows my mind.
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