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Translation via Google Translate:
When I plug the headset on to the telephone, the sound does not sound correct, there is a muffled sound. I can not listen to music at all with the headset. Ever since I took the phone, this is the problem.
Kulaklığı telofona taktığım zaman ses doğru düzgün gelmiyor,sürekli boğuk boğuk bir ses geliyor.Daha doğrusu kulaklıkla hiç müzik dinleyemiyorum.Telefonu aldığımdan beri bu sorun böyle.Bu sorun nasıl düzelicek yardımcı olur musunuz lütfen?
I used Google Translate to find the meaning of your message. Kindly post your future questions/feedbacks in English so we can assist you, this is an English based forum.
Does this happen with only one headset, or you already tried different headsets?
I tried all the headphones
Start troubleshooting by restarting your phone into safe mode, this will disable all installed 3rd party apps. If the problem is resolved then one of your installed apps is causing this issue and you have to figure out which one. Start by uninstalling those apps you installed recently.
Unfortunately, he still has the same problem
Then your last resort is performing a software repair using Xperia Companion. This will do a clean installation of the latest firmware and will also wipe your internal memory. Don't forget to backup using Xperia Companion, but preferably without adding apps or settings to the backup.
If the software repair didn't help either, then this might be a hardware issue. You'll need to contact your Local support in this case and get your phone examined.
Follow the steps given in blue links, and keep us updated.