Cannot update to iOS 4.0 on 3gs

[i.Annie]

Aha! Very good point, totally forgot about that. I have seen a couple users who have had this problem and realized they didn't have the device that they thought they had.

[jhgduen]

im in the same boat as docneon i am having the same problem and ive tried everything but nothings works :@

although now i have managed to get my iPhone officially unlocked does that mean i can just upgrade to 4.1 and ill still have unlock??