If you backup your original file, nothing bad can happen to your phone.
Worst case scenerio you end up with a bootloop, then you'll just run ClockworkMod recovery and push the original file back...
I recommend to backup by nandroid anyway
you never know 
Worst case scenerio you end up with a bootloop, then you'll just run ClockworkMod recovery and push the original file back...
I recommend to backup by nandroid anyway
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