DON'T do the DROID X update. It will brick your phone and Verizon will not help at all. (tech support & in store) The reps kept telling me "sorry for the inconvenience" but you can upgrade your phone. My point is simple: prior to update my phone worked; after the update it is a brick. They still offered no support and told me to call Motorola.
Motorola should take the phone back but will leave you without a phone.
Hard Resetting the device usually can resolve the device when a update fails.. Follow instructions from http://support.verizonwireless.com/clc/devices/knowledge_base.html?id=33552
Android version 2.3 (Gingerbread)
I understand the nature of your problem and I experienced this issue with my device before and this has worked on a number of other users devices, the thing is they usually was worried because the device wouldn't bootup to get to the hard reset menu. The method I posted usually works for situations like this.
You reported the device bricked but If you are able to get into this menu I would then say the device isn't bricked and there is a possibility to bring it back..
Right, I get that this is the standard factory reset procedure. Using the technicians own words "oh it looks like your phone is dead". It seems that this is a known issue at this point and Motorola is fixing it free of charge but be prepared to go without a phone for a few days.
Ok, I understand your side but on the same note consider this doesn't mean that all devices will meet the same conclusion, my Droid X hasn't experienced any issue after the update and others have reported the same... I understand not all has been so lucky.
Appreciate the update on your situation and I hope the replacement works out better for you...