Updating a jailbroken iphone
However, if you want to step up to the 11th i OS generation you have to use i Tunes.
Saurik, the developer of the Cydia i OS launcher, has recently announced that he’s very close to a public release of the i OS 11.1.2 jailbreak.
The fastest way to get this process done would be to locate the correct i OS 11.1.2 IPSW file, plug the device into your computer, and do a manual restore.
The problem with that is that Apple is only currently signing i OS 11.2 and 11.2.1, which will cause the authentication process to fail and either leave you stuck on your old i OS 1.3.x or — far worse — force you to update to 11.2.x.
With a firm confirmation, it’s now safe to start making the jump.
Make sure you read over the process before you begin, as once you start it may be difficult to go back.Before updating to the new i OS firmware, it is a good habit to completely backup your i OS device.This is just to make sure that in case something goes wrong during the update and your data gets wiped, you can restore it from the backup. As mentioned earlier, if you are not able to download i OS 9 via the OTA update, then you can update to i OS 9 officially using i Tunes.Read the tips below for Upgrading your existing jailbroken i Phone with Cydia installed to new i OS 9 – i OS 9.1 firmware .