How to upgrade jailbroken iphone without losing apps & data?

I have a jailbroken iphone 4s running ios 5.0.1. I want to upgrade to ios 6 but don't want to lose all my data & cool tweaks from cydia. What would be the best way to do this?

As far as I know, it's not possible to do it

Seems it's still can't but you can try PC Suite for that http://91.pandaapp.com/

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