I'm on Rubix .5 and contrary to the directions, I'm not going to wipe Data and Cache. Sorry, but I hate having to set up everything again and re-install all my apps. If it fails, then I will, but I'm just too lazy right now to do it that way. Again, I'm going to try this contrary to the directions. When I went up from .3 to .5, I didn't wipe Data/Cache and all went great. Hope it does again too.