A few days back a well hacker and security researcher Luca Todesco nnounces that now it is possible to upgrade and downgrade the iOS 10.1.1 based on reboot and karnel Google’s project zero and the upcoming tool is applicable 64 bit iOS.If it may be successful it will welcome the jailbreak community and allow the firmwaver,save the blobs and  even after the apple signing window has been closed.

downgrade ios 8.4.1 Prometheu: an upcoming tool that allows unsigned iOS user to upgrade and downgrade
downgrade iOS

via:iphoneheat.com

To download and install Prometheus SHSH2 blobs is required for upgrade and downgrade the iOS when you install new blob previous blob will not work.

download 1 6 Prometheu: an upcoming tool that allows unsigned iOS user to upgrade and downgrade
Prometheu tool

via:cydiawater.com

There are  tihmstar’s tool called tsschecker and there following a guide.

“The news of Prometheus is especially salient to people who are interested in a possible upcoming iOS 10.1.1 jailbreak but who don’t want to jump ship yet and lose their current jailbreak. If you save the .shsh2 blobs for iOS 10.1.1 now, before the signing window closes, you may be able to upgrade from 9.3.3 to 10.1.1 at a later date even if iOS 10.1.1 is no longer being signed. Of course, this is provisional and no foolproof guarantees have been made, but I would recommend saving the blobs anyway as you have little to lose and it doesn’t take long. You may decide later you want to give it a go.

Tihmstar has said that although 32-bit support is possible, Prometheus will initially be just for 64-bit devices. However, as I mentioned briefly in a previous post, several downgrade tools for 32-bit devices already exist, such as tihmstar’s OdysseusOTA2, Dayt0n’s Odysseus, and geeksn0w’s Beehind, so you could try those instead.”

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