how were you able to get 3g? i can make calls, send and receive text. i have the right apn because i tried it on another android. did you use a rom? my droid 3 is unlocked.
if you are rooted, just unroot. you wont have any problems. if verizon cannot turn the phone on, they will also replace it because they cannot prove it is rooted.
i havent really had any battery problems after the update. I once had a problem with the phone not charging my battery once totally drained, but no big issue