Unlocked iPhone/Jailbroken/T-mobile

[gonzr]

iPhone 2g, running version 2.2.1 build version 5H11.
If I were to update it, would it still be unlocked for use on T-mobile?

 

[PsstGreek]

iPhone 2g, running version 2.2.1 build version 5H11.
If I were to update it, would it still be unlocked for use on T-mobile?

Nope. Once you update/restore the unlock/jailbreak goes away. You can update to 3.1.3 (latest 2G goes up to) and unlock/jailbreak with Redsn0w.