This is a free Chinese app which can improve the sound effect greatly on your android devices and it supports multy language
1.http://db.tt/vhk7oLj6 install and update it
2.http://db.tt/UUJRboRm install it
3.reboot your device
Enjoy it!
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I believe Xiaomi will sell their products out of China in the near future cus they've already been selling them in Hong Kong(though it belongs to China now,still not in the mainland anyway)