quick question. Been trying to find the answer to this but nu success.

My 2g phone with software 2.2 is jailbroken.

I realized that I dont use the cydia apps very much and I dont need it to be unlocked cause Im with ATT.

So my plan is to just do a normal upgrade thru Itunes..

So the Question is, will this hurt the phone in anyway? Will I lose any other information except the cydia apps and other jailbroken stuff?