Like me many a15 users facing issues after installing beats audio .. Dsp manager and music fx gets corrupt .I got the success of coming out from this issue without going to service station. So i am writing steps which will help you to recover our mobile's audio . 1. Installed root explorer and busybox 2. Deleted music fx folder from system files.. and also all the files in system/lib,,,, system/etc ,,,system/bin ...which contains beats name .....(eg beatsaud.sh..and many more with beats ) 3.Uninstalled music fx and DSP manager from my cell Since this are system apps you need some system app removal app .I am using SysApp Remover. After this i did factory reset of my phone 3 to 4 times and to my surprise audio started working again without any issues ..only dsp manager and musicfx are not working .. You can try this steps but i am not giving you 100% gurantee about this .It worked for me but dont know exactly which step solves this issue. After this just istall some good music player like winamp .