GEOHOT SAYS-

"Don't Update

A note to people interested in the exploit and retaining OtherOS support, DO NOT UPDATE. When 3.21 comes out, I will look into a safe way of updating to retain OtherOS support, perhaps something like Hellcat's Recovery Flasher. I never intended to touch CFW, but if that's how you want to play."

http://geohotps3.blogspot.com/2010/03/dont-update…