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Guide for downgrading checkm8 devices
This is a guide for downgrading (or upgrading) to unsigned versions with futurerestore on checkm8 devices (A11 and below) from any version without needing an actual jailbreak, as the checkm8 exploit itself works in DFU mode regardless. You must have blobs for the version you want to go to, and SEP/BB compatibility may limit how far you can go.
Current SEP compatibility
For devices that got iOS 16, all iOS 15 versions (including 15.6 RC) are now UNSIGNED.