Restoring factory settings

what's best way can restore iphone factory settings, install ios 4.3.3 while keeping baseband @ 05.12.01 can still unlocked?

have 3gs, ios 3.1.3 baseband 05.12.01. don't have shsh 3.1.3, 4.0 , above. if restore stock firmware 3.1.3, baseband upgraded?

because of current battery issues ios 5, goal upgrade ios 4.3.3 now. need factory settings because phone getting corrupt many apps.

 

you need save ssh blobs tiny umbrella

 

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