How do I revert back to old OS 2.2.1?

[jra511]

Hi, I'm running the new beta 3.0 OS for the iPhone and want to know how to revert back to the old OS? The reason? The new beta 3.0 version is crashing my iPhone at least 3-5 times a day. Not a good think when I rely so heavily on it for work. More specifically, my corporate email keeps crashing. My inbox is blanked and then the phone goes through the whole process of pulling email from the corporate server. Anyone out there who can help me with this?

Thanks in advance!

 

[shutter]

http://forum.theiphoneblog.com/iphone-developer-forum/170532-downgrading-3-0-back-2-2-1-a.html