I just got this HTC thunderbolt from a friend and downloaded the software update from verizon to it. It rebooted and then I got
*** LOCKED ***
*** Security Warning ***
MECHA XD SHIP S-ON
HBOOT - 1.050000
July 19 2011, 14:51:08
I have pressed all of the options but don't know how to get the phone going again, please help!
Do you have a way to connect the SDCard to your computer? My guess is the phone wasn't stock when your friend gave it to you and the OTA made it mad. In that case, Verizon will most likely be of no help. You should be able to get the signed 2.11.605.19 RUU from here which can be installed in HBOOT. If that doesn't work, you'll likely have to go to one of the more developer friendly sites for help
I fixed this issue by opening my thunderbolt, revmoving the battery and sd card, reinserting the battery and rebooting (without the sd card) after it powered up and logged in fine, I shut it down and reinserted the sd card and it booted fine.