Hi there... I am also trying to install the update.zip onto my thunderbolt (the ota from yesterday). you said that you have to rename it to PG05img.zip, put it in the root of your sd card and then install. by doing this, does it wipe your device or does it keep everything intact (like the true ota does)? For some reason i am not getting the ota update (i am on stock and i am not rooted) thanks for you help