unlocking iphone 2g to 3.1.3?

asdfzx

New member
my iphone 2g is unlocked on firmware 3.0 right now. if i backup my phone and update it to 3.1.3 and go and unlock it through redsnow can i go back and restore my iphone so that i can keep my texts/apps/contacts while staying on firmware 3.1.3?
 
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