Picked up my Thunderbolt and found an Android on the screen with an triangle and exclamation point in the center. Phone is rooted and with the Thunderbolt Auto Root MR1. If I boot the phone into recovery mode the will ask me if I want to start the update and if I select no it will power up normally and after a few minutes power down automatically. The it will repower up show a box with a curvy arrow coming out of it and then lock up. Please help, I am not very fluent in this and I need assistance.