This is the fix for Audio/Sound on any Jelly Bean ROM on any device. JB needs this file "/system/etc/media_codecs.xml" This file is missing, but simply copying the file there using Root Explorer or any file explorer with root access works. This does not require a permissions change. The file is not there originally so you won't be overwriting anything. I did this fix on my Atrix 4G and it worked perfectly. It is universal and will work on any Jelly Bean ROM on any device with this issue. Here is a link to the file: http://forum.xda-developers.com/atta...9&d=1342668760 Steps: - Extract "media_codecs.xml" - Copy it to /system/etc/ - Make sure to mount system as R/W (read/write) before pasting the file - Reboot - Sound Fixed! ae thử xem được không