Yes the Crackberry PB app is an android port. Back swipes are where you swipe from right to left on the bottom bezel to emulate pressing the android back arrow.
You reload the OS through Desktop Manager, there is probably a there here that explains, let me see if I can did one up. If not can I post one from the BB site or CB, NJ? I guess the BB site should be fine.
Edit:
http://supportforums.blackberry.com/...Y/td-p/1822649