I have Droid X I rooted. When the 2.3.340 update came out I tried to update my phone. It will not updated. I unrooted my phone it still won't up date. I deleted some of the factory apps such as Amazon. Is there any way to update a rooted phone?
root blocks OTA updates so that root isnt accidentally removed by the update. The only way I know to update a rooted phone via OTA updates is to completely unroot the phone (remove the custom recovery and su apk and binary) and then apply the update.
Now for the even bigger question: why do you want the update? You most likely already have the features of the update included in the rom that you are currently running.