You should open iTunes and make sure All your apps and music and whatever else are all configured the way you want. (with what will sync and stuff)
Then you should transfer all purchases.
Then you should backup if you want to save your text threads
Then restore as new.
You will end up on latest firmware.
Then if you want to get your text threads back, restore from backup.
Then sync your phone.
Then jailbreak.
Then reinstall all your cydia stuff
You should open iTunes and make sure All your apps and music and whatever else are all configured the way you want. (with what will sync and stuff)
Then you should transfer all purchases.
Then you should backup if you want to save your text threads
Then restore as new.
You will end up on latest firmware.
Then if you want to get your text threads back, restore from backup.
Then sync your phone.
Then jailbreak.
Then reinstall all your cydia stuff