I heard that you can "half" upgrade (soft upgrade?) to 1.1.3/1.1.4. I would like to do this so I could get yahoo mail to work with the mail app. Can I do this, and how? And it's not like a real upgrade/jailbreak to 1.1.3/1.1.4 right? It won't mess anything up? EDIT: I'm basically asking if a soft upgrade to 1.1.4 will have a working yahoo mail and won't erase all my current apps.