First, you must be fully stock, no apps frozen, deleted, disabled. No apps installed as system apps that weren't on the phone from the factory, and no mods to the system like the Hotspot hack. THEN, you MUST be sure which version you are currently running. There are TWO updates out there...one for the 6.16.211.XT912.Verizon.en.US Ice Cream Sandwich phones and the other for the Christmas Eve (Festivus for the restofus) Jelly Bean leak version 98.72.8.XT912.Verizon.en.US. See this thread;
http://www.droidforums.net/forum/dr...-maxx-tester-s-hands-files-available-now.html
If you try to install the wrong version it WILL fail.
Then, you must make sure the version you download is a good copy with no download errors.
Finally, you should at least try a Factory Data Restore and try upgrading one more time before resorting to the option below that fits your phone.
If you do all of the above and you are unsuccessful, and you ARE on .211, then it's time to do a Fastboot back to .211 and start over using the
Droid RAZR Utility Version 1.82 by Matt Groff.
If you do all of the above and you are unsuccessful, and you ARE on .8, then it's time to think about soft-bricking to start over. See THIS thread
http://www.droidforums.net/forum/dr...ricked-after-reverting-jelly-bean-update.html for the step by step instructions. For me, I had to do this and it worked, but it was a bit hair-raising. You are essentially making the phone completely unusable for a period of time, then recovering from that state of brickdom to flash back to a working OS, then doing the upgrade. It's an extreme choice but it works.