Re: Update
If you update the firmware you will need to rejailbreak it. But there is way to not loose any information.
First - installed APT Backup from Cydia (if you don't already have it)
Second - run backup in APT Backup (this will create a list of all the cydia items you have installed)
Third - perform back of iPhone in iTunes
Fourth - update firmware
Fifth - jailbreak phone
Sixth - install APT Backup from Cydia
Seventh - Restore from back in iTunes
Eighth - run restore in APT Backup
I know this may seem complicated, but I have updated firmare for 5-6 phones via this method and it works 100% of the time.
**Note 1: What APT Backup does is makes a list of your Cydia items. When you do the restore it hits Cydia and redownloads that list, so it may take a few mins depending on how much stuff you have grabbed from Cydia.**
**Note 2: If you use Categories, you may not see the items you have in the categories until after you have ran the restore in APT Backup and categories get downloaded**
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