The install will completely wipe out your phone as it overwrites the operating system and the radio firmware, no way around that.

I installed the update yesterday andonly ran into one snag. When I tried to install it from my laptop, the installer would hang when attempting to detect the current software version on the phone. Once I ran the installer form my desktop PC, it went without a hitch.

Finally, bluetooth and voice command work as they should have from the beginning.