What will be the method to upgrade my iPhone 6s Plus iOS 9.3.3 to iOS 10 when a jailbreak is released for iOS 10 ? Will I have to start fresh or over per say ? Please explain to me the exact method to go from iOS 9.3.3 to iOS 10 once iOS 10 is jailbroken if ever?
Here is how I do it, a method that has worked well for me each time.
When a jailbreak drops.
1. Send myself a list of tweaks or screenshot all tweaks in Cydia.
2. Backup device using iTunes.
3. Turn off Find My iPhone
4. Put device in DFU mode, upgrade and restore as new.
5. Jailbreak.
6. Restore device from backup.
7. Reinstall tweaks from list or screenshot paying careful attention to those that may not be updated to the current firmware or tweaks that no longer serve a purpose.
An example of a tweak that no longer serves a purpose would be the iOS 6 tweak Luna which allowed you to turn on DND when your device was locked. That's a stock iOS thing now. Same can be said for Gridlock. Anchor now does what Gridlock used to do.
This process has worked fairly well for me.
Most people will advise to set up as new and just recreate everything. You should do that, it's the correct method. But I'm just too lazy to do that and I've rarely had issues with my backups. The profile I have now is originally from my iPhone 3GS.
Choosing how you want to set up again though is up to you.