For the purpose of this guide, I will use as an example upgrading from 2.0.2 to 2.1. First off, if you have never jailbroken, you don’t need to worry about this guide. The complications come when you have a jailbroken device and you want to upgrade.
Just hook your i Phone up to your computer and tap the “upgrade” button and wait. Say you are running 2.0.2 and have a lot of Cydia apps installed.
Open the i Phone page once the device is detected, it will open the summary page of your device.Here, select might update your device, but you will lose some disk space because of the file system changes made by Cydia.Undeterred jailbreak most recent i OS 9 let loose is to be there contained by subsequent to with the aim of month’s 2015.You should end up with a non-jailbroken device with all your content excluding content for tweaks. If you haven’t jailbroken your i Phone, you can just head over to your its settings and tap the option Software Update to download and install i OS 9.