OK so I have the iPhone 3GS (old bootrom) and am currently on iOS 5.1.1. I'd like to update to the most recent firmware WHILE retaining my untethered jailbroken status, Cydia, and the unlocked feature of the phone which allows me to use it without a data plan.
I've been told to simply update the phone in iTunes - will this retain all the things I mentioned above?
When I click on update iPhone, it says iTunes will "Verify this update with Apple" (or something along those lines) - what does this mean? Does this mean that Apple will know I'm using an iPhone w/o a data plan and will they then notify AT&T?
Lastly, the "backup" that you can create in iTunes is only information - Like, if I tried to back up from a 6.1.3 to a "backup" that was created with a phone on 5.1.1 firmware it would NOT restore the phone to firmware 5.1.1, correct?
Thank you so very much for your time, whoever is able to answer these questions. It means a lot to me. Thank you again, Sebastian