Hi, been reading around on the info on how to upgrade my HTC Desire to 2.2 without having to wait 'weeks' for O2 to offer it to it's customers, because I'm sure it takes weeks to stick a splash screen and enter a few settings on an Android build. 
However, all the guides I've seen appear to be just to completely install 2.2 from afresh, and wiping everything off your phone. I don't want to do this as it will be a pain to set it back up to how it was before.
Is there a way I can just upgrade my 2.1 O2 UK desire to 2.2 without wiping anything?

However, all the guides I've seen appear to be just to completely install 2.2 from afresh, and wiping everything off your phone. I don't want to do this as it will be a pain to set it back up to how it was before.
Is there a way I can just upgrade my 2.1 O2 UK desire to 2.2 without wiping anything?