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
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30 Aug 2014
By Tomek Kondrat
XDA Developers was founded by developers, for developers. It is now a valuable resource for people who want to make the most of their mobile devices, from customizing the look and feel to adding new functionality. Are you a developer?