I used z4 root to root my droid x 2.2.1. I used the wireless tether feature with no problems. However, one night my phone updated to 2.3.3. The wireless tether feature has not worked since. When I try to open wireless tether I get the message " unable to start tether, is your phone rooted. Is it safe to use the same version of z4 to unroot my phone even though the operating system has changed. Please help!