Errors while updating iphone 3gs from ios 4.3.3 to ios 5.1.1?

Ok so i hae an iphone 3gs factory unlocked and jailbroken but i can't seem to update i either get 3142 or error 1600 1602 or error 11 any help will be appreciated i believe its an old botrom its before week 30

Try downgraded from 4.3.3 to 4.2.1 then upgraded 5.1.1. I don't know if it would work i had a 3g but now i'm using an android. But try that if not search the error codes on google. Plus it could be the verison of itunes

Those errors usually come up when there's a problem with the computer (not the phone)

Make sure you're running the latest version of iTunes on the computer.
If it's the latest version, reboot the computer and start iTunes straight away then try again.
If it happens again, reinstall iTunes or try it on another computer.

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