HTC THUNDERBOLT VER 3.0
GINGERBREAD 2.3.6
PRESS POWER BUTTON FOR ABOUT 1/2 A SEC.
THEN PRESS THE HOME ICON AT THE BOTTOM LEFT
OF THE UNIT and "Presto" it's done.
For me it was an acccident. It took almost a week to
Repeat it. By the way my phone is not rooted, and i am not using
Any app for...