Downgrade / Upgrade to Any Unsigned iOS Version Using Prometheus – How to


Here's how you can use Prometheus to downgrade or upgrade your iOS device to any unsigned firmware version.

Prometheus Has Been Released, You Can Now Downgrade / Upgrade to Any Unsigned iOS Firmware on the Fly

As promised, Prometheus, the tool that allows downgrade or upgrade to an unsigned iOS firmware, has been released. And while the tool may sound like a godsend, which it is, there are still some hard and fast prerequisites one has to follow before anything can happen at all. First and foremost, and it's a strict requirement, you must have your SHSH2 blobs saved for the firmware version you are downgrading or upgrading to. If you haven't saved your SHSH2 blobs already, then you can do so by following the guide posted here: How to Save SHSH2 Blobs for Unsigned iOS Downgrade / Upgrade.

Next up, the tool works on 64-bit devices at the time of writing and support for iPhone 7 and iPhone 7 Plus is somewhat broken. Support for more devices is on the way though. Moving on, the tool allows you to upgrade from iOS 9.x to iOS 10.x with ease, and within different versions of iOS 9.x. However, you cannot downgrade from iOS 10.x to iOS 9.x. If you were planning on doing so, then you might want to put things to rest. Last but not the least, the tool works for both jailbroken and non-jailbreak devices, which is a huge plus.

If you are all up for downgrading or upgrading your device to unsigned firmware, then you can download the Prometheus files from here. The tool is available for Mac only for now, Linux and Windows versions will be available later.

Check out the tutorial videos below to jump straight into the action. Remember, it's best to watch the videos at least a few times before performing the entire feat yourself.

Wrap Up

If you have no clue what is going on, it's highly recommended that you source someone down near you that does. It's not worth risking things at all, and it's best to let an expert do their thing for you. Last but not the least, make sure you have your SHSH2 blobs saved at all times. You never ever know when they might come in handy. It's always a good idea to keep them saved in a nice and cosy location for later use.

Do let us know if you ended up using Prometheus to upgrade or downgrade your device.