IOS 10.2.1 took place over a month ago and there’s a chance that upgrading to the new firmware, you decide to downgrade to revert to the previous version of the OS. After all, iOS 10.2 – the latest version for which tools are available to jailbreak.
Last year the owners of iPhone and iPad have been able to downgrade iOS using special tool Prometheus. If digital certificates Blobs that the user can return to the previous Assembly. Unfortunately, in December, Apple has blocked the work of the utility.
Up to this point the rollback to the previous version was impossible. Now, through the efforts of the developer Tihmstar such an opportunity. Immediately it should be said that it is necessary to observe several conditions. First, you need to be the owner of the iPhone 5s, other models are not supported yet. Second, should be available .SHSH2 blobs for iOS 10.2. This is the minimum required to use the tool.
In order to downgrade the firmware on iOS 10.2, you need to go from iOS to iOS 10.2.1 10.3 beta 1 and use the utility futurerestore from the set of Prometheus. After a rollback 10.2 on iOS you can jailbreak on the instructions published here.
It is understood that in order to use Prometheus you must have a certificate in a special format shsh2. They must be saved in a time when Apple still sign iOS 10.2. To do this for the current firmware you can use TSSchecker of this manual.
If you have a saved certificates and iPhone 5s you can downgrade to an earlier iOS version.
