I changed the build.prob file in the system directory with a file manager on the phone. Now it won't boot. All I get is the word android, upside-down. I can access the build.prob file with the adb shell, but can't change it back because it is read only. I tried to get write access by typing “su” but then I am supposed to hit a button on the phone which is still only displaying “android” (upside-down). Is there another way I can get write privileges to change the file back to what it was before I started messing around? Thanks for any help.