Originally Posted by
freshie101 I am currently on 3.1.3 on my iphone 3GS.
Not the latest iTunes, trying to upgrade it to version 4.0
You cannot upgrade to 4.0 unless you have SHSH blobs saved for that firmware since 4.0 is not the most current firmware. You will have to upgrade to 4.1, and if you wait too much longer, 4.2.
Also make sure you have the newest itunes.