How do I downgrade my iPhone 3GS from version 4.1 to 3.1.2?

Nole

New member
I have an iPhone 3gs vesion 4.1 and it has never been jail-broken before. Is it possible for me to downgrade my 3gs from firmware 4.1 to 3.1.2? If so, can you please tell me how? Please provide detailed instructions and links. Thanks!
 
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