Originally Posted by 1krzys
i don;t have root on phone ...
You need to root your phone.
The best guide is this: http://forum.xda-developers.com/show....php?t=2642081
Then, you can backup your DRM keys, and unlock your bootloadear (the backup is for relocking it, and "restore" your warranty
I didn´t want to unlock the bootloader... so only rooted the phone. Then, installed SDFix, Xposed, and System app uninstaller... and then this phone became even better