Why does my Android System have an update failure Droid Razr m xt907?

I was updating motorola droid razr m xt907 from 4.1.2
Steps i performed:
1. Setting -> About Phone ->System Update
2. After download complete. A pop up appeared with Install Later and Install Now
3. I selected Install Now.

Phone turned off and started installing with Android picture and progress bar.
On progress bar complete, Phone is now blank/black screen.

I was waiting that it will turn ON by Auto. But it wasn't. After waiting i tried myself to turn it ON.
But it is not Turning ON. What's happened with it?

Thanks,

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