In order to be on the update path, your phone must NOT be rooted, and must not have any stock apps either frozen or deleted. In other words, from the installation package's point of view it should appear completely stock. You CAN preserve root through the update with Voodoo OTA Rootkeeper, but you will have to temp-unroot with it to complete the update.
You may be forced to do the same steps you did before to get on the update path. The easiest way to do this is
UPDATED Droid RAZR Utility [WINDOWS]. This will provide you all the tools you need to restore to stock, root, protect root, temp-unroot, and be a safety net in case the update goes bad.