For rooting read this tutorial, there is also a video:
[ROOT] Saferoot: Root for VRUEMJ7, MK2, and Android 4.3
after you root your phone:
1.Download these files and put into sd-card:
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dl.twrp.me - twrp-2.8.7.0-jfltevzw.img
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androidfilehost.com - Debrick-i545-MJ7.zip
2.install Goo Manager from Play Store..
3.Run Goo Manager hit install Openrecoveryscript.. select the file "twrp-2.8.7.0-jfltevzw.img" from sdcard
4.Hit Reboot Recovery
5.In Recovery select update zip from sd card select "Debrick-i545-MJ7.zip"