HT4623 whenever i update my 3gs it locks and i cant unlock it because  i cant download earlier version what gives.

whenever i try to update my 3gs i locks on me and i can't unlock it  because i would have to download  an earlier version  of itunes  which doesn't work  can you help me?

You need a valid SIM card from the carrier to which the phone is locked.  It sounds like you do not have a legitimately unlocked iPhone, and upgrading the iOS has re-locked it to the legitimate carrier
Only the carrier can unlock the phone.

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