How to install Kitkat (4.4.2) and ubrick Motorola droid razr m xt907 (step by step)

Requirements :

Download firmware file  from 

Download RSD drivers from Motorola site

Installing :

1 : install RSD tool And drivers on your Computer
2 : Run RSD lite program
3 : Extract firmware file
4 : on RSD tool Select this xml file  VZW_XT907_4.4.2-KDA20.62-15.1_1FF.xml  from firmware extracted folder
5 : put your phone in fastboot mode by power off your phone and press and hold these keys (power+volume up and down) then a new screen appears navigate ap fastboot select it with volume up key And connect with computer  Note: make sure drivers installed on your 
6: on Rsd tool your device appears 
7 : click on start and wait until RSD lite tool pass your phone
8 : if your phone again goes in fastboot mode then press power for 3 sec after off press power+volume up+down and select normal power with volume up key
9 :After reboot set your setting 
10: D:)one  

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