

If you have a non-jailbroken device, follow the complete video. With this tool they can save the blobs for iOS 10.1.1 without installing it and upgrade from an earlier version to iOS 10.1.1 once a jailbreak is made. Just ignore the nonce collision method because that is for people whose devices aren’t jailbroken. Prometheus tool is going to be super useful for users, especially those who want to be able to upgrade to iOS 10.1.1 when its jailbreak is released, while currently remaining on jailbroken iOS 9. Those coming here from the first step need to follow the instructions up to six minutes.

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The second video outlines how to restore an unsigned iOS firmware using the futurerestore tool of Prometheus. Once the device goes into recovery mode, jump to the second step. Watch this video to see how to set the nonce with nonceEnabler.
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Once you manually set the specific nonce, it would match the generator in the SHSH2 blobs saved and the restore would be accepted without any issues. The first video details how you can use your jailbroken device to set a specific nonce. But if you are attempting it without a jailbreak, but have the blobs saved with the five nonces Tihmstar made public, go to the second step. If your iOS device is jailbroken, and have the blobs saved with a generator, follow both steps. A new tool called Prometheus, announced by tihmstar, will allow users to effortlessly downgrade or upgrade their device firmware without worrying about it being signed or not. To make things a little easier, below are the two steps to complete the process. Tihmstar has created two videos detailing the process, and you may have to follow instructions in both of them depending on whether or not your device is jailbroken. There has been a lot of confusion regarding how to follow the upgrade/downgrade process. This requires the SHSH2 blobs saved with a specific nonce and no generator. The second method, which uses only futurerestore, does not require a jailbreak. This method uses nonceEnabler and futurerestore together. The first method requires a jailbreak and SHSH2 blobs saved with a generator. Prometheus can be used in two ways depending on whether your device is jailbroken. Two ways to upgrade/downgrade unsigned iOS firmware
