Unable to upgrade 3GS after ATT unlocked it

Hi
I own an iphone 5 and an iphone 3GS that I use for international travel.
The iphone 3GS was unlocked by ATT successfully, but it has an older 4 version of iOS and the apps require minimum ios5.
I have tried to upgrade to ios5 but the itunes says that is the most current version.
Any ideas why it wont upgrade and how to make it upgrade.
Thanks in advance for your comments.

Hi and thanks for the replies
I checked the serial and the phone has no warranty. That is OK, but I try to upgrade I click the iTunes button (phone) to Check for Updates and it says that it is that Version 4.2.1 is the current version.
My phone is a 3GS and ATT (before to unlock) told me to back it up, erase and restore. I read that to upgrade to ios5 you need to again, back it up, clean up phone and check for updates and then restore the backup. But now I am scared that it will lock it again. I guess I can request for ATT to lock if anything happens...
Any help or ideas will be appreciated.

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