how to downgrade iphone 3gs 4.2.1 back to 4.1 or 4.0?

H

Hisham Wani

New member
i got my iphone 3gs 4.1 upgraded and jailbreaked to 4.2.1 but now if i switch the phone off i cant switch it on back i am stuck at apple logo... so, i want to downgrade it back to any possible lower version.....
anybody plz give me complete details how to downgrade and jailbreak as well as unlock
 
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