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# Downgrading iOS devices

### Downgrading is a key part of Jailbreaking.

It allows you to go to one iOS version to another, regardless of wether or not Apple is signing that version. This can be used, for example, to go from iOS 10.2 to iOS 11.1.2, when 11.1.2 is no longer signed.

## 64-bit devices

### Requirements:

64-bit devices are very protected in comparison to 32-bit devices. One major way is within the SEP. This handles some security processes on the device, most notably touchID. It runs it's own OS, which is also signed by Apple. sepOS must be compatible with iOS for a successful restore process.

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