Here are the fastboot files for the Motorola DROID RAZR, you can use these files to
flash your phone back to stock if you run into problems or just want to unroot.
Power off your phone.
Power your phone on while holding the volume up, down and power buttons at the same time.
Using the volume down button, hover over “AP Fastboot”, use volume up to select.
Open RSD Lite, press the “…” button at the top, navigate to and select the fastboot files you downloaded.
Select “uncompress and start flashing”.
To get completely back to stock, you will have to preform a factory reset after flashing.