#Impossible installer tinyumbrella update#

When you update your firmware through an iOS update, you are guaranteed to loose your jailbreak and all its related data. Having the SHSH for those iOS's mean that you can theoretically downgrade your iPhone software to any of those versions by bypassing the Apple server. It will tell you which iOS SHSH file you have stored on the Cydia server. You can tell if your SHSH file is already stored in Cydia server by opening Cydia on your iPhone and looking at the top of the Cydia screen as shown in the picture above. The solution is to back up the SHSH signature file on a localĬomputer. Therefore, you can never restore an iPhone to an older version of the iOS. IPhone or iPhone 4 and therefore if iTunes doesn't have the iPhone firmware signature file on the Apple server, it will be impossible for you to do an iPhone restore to a previous iOS with that iPhone.Īpple only keeps the signature file for the latest iOS release and it stops signing older iPhone software. SHSH ECID ( Exclusive Chip ID) is a security measure by Apple to prevent people from downgrading their iPhone firmware, or from restoring their SHSH stands for Secure Handling Signal Handling which is a signature file that Apple uses through iTunes to check the status of your iPhone software or firmware. This will allow you to safely downgrade your iPhone firmware to a previous version at any time. To avoid those types of accidents, it is best to backup your SHSH signature file to a Cydia server or better locally on yourĬomputer. If you are lucky you might be able to re-jailbreak after the iOS update, but it might be almost impossible to unlock your iPhone as the baseband might also have been updated. You will loose both your jailbreak and unlock. Unlocked, and you accidentally update it, you might have nightmare. Apple iPhone updates are usually a good thing as they add more features and fix bugs.

#Impossible installer tinyumbrella upgrade#

It is very normal to accidentally upgrade your iPhone Software or iOS using iTunes while you are syncing. However, you must have a signature file called SHSH stored on a local drive to be able to complete the downgrade successfully. It is sometimes possible to downgrade iPhone firmware to an earlier version.