I have rooted this phone twice now and did step by step instructions and all of the sudden I get an update and the phone acts like it is not rooted anymore. Wifi tether will not work a week or so after I verified that is worked. It says unable to start tether is your phone rooted? I used Z4root, Droid 2 bootstrap and am running gingerbread. Z4root no longer shows in the app tray. In settings it says I have android version 2.3.3. Any help.