With the help of this post you will be able to Update Droid Razr to Jelly Bean 4.1.2 Official.
Motorola Rolled out the Jelly Bean Update for the Droid Razr XT912 a bit of time ago, but the OTA update was not seeded to all the users. If you did not get the OTA update from the company, do not worry, you can follow this post to officially update Droid Razr to Jelly Bean Version 4.1.2. Also by applying the update the Root users will lost the root access to their phone, but do not worry, if you want to keep the root access and also update Droid Razr to Jelly bean, I have mentioned a workaround below. This tutorial will help Rooted as well as unrooted users to Update Droid