I have an iPhone 1.1.2 OTB with o2 in uk. I tried to jailbreak it and everything worked fine : I downgraded it to 1.1.1, jailbroke it and installed a few apps to test if it works, but when I try to upgrade it back to 1.1.2 iTunes tells me that it can't connect to my phone to install the upgrade (but i can still see it in iTunes and sync it for music, etc...)

does anybody had this problem and manage to solve it ?