iPhone backup and Restore

i have unlocked , jailbroken iphone 3gs v 4.1. have been told can upgrade v5.1 , still unlock , jailbreak lose data. phone go it's original position. want know if possible data , programs.upgrade , reinstall without causing phone lock. ideas?

 

http://blog.iphone-dev.org/page/2

looks first article applies you.

if backup 3gs itunes , update 5.0 can restore backup put data on phone, except jailbroken info. looks custom ipsw best route you.

 

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