EDIT DATE: 2022-07-18
Use irecovery from Homebrew
EDIT DATE: 2022-06-13
Fix the problem presented by GitHub user xrotorhead
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A nonce setter for iPad Pro 10.5 inch (model Identifier: iPad7,4) which is compatible with checkm8, was modified from MatthewPierson/checkm8-nonce-setter.
iOS version doesn’t matter. If your device model is iPad7,4 then you can set your nonce and downgrade. This script is macOS only.
"main.sh"to the Terminal window
Thats it. The script will tell you what to do.
You may need ldid or libirecovery installed via Homebrew for this to work. There shouldn’t be any other dependencies
After setting nonce with this, you can FutureRestore with the shsh you used during the script.
Keep in mind SEP and Baseband both need to be compatible with the version you are trying to downgrade to. This script doesn’t change that, only allows you to set your nonce without being jailbroken.
However, this will be useless for downgrading when some iOS 15.4+ SEP&Baseband is not compatible with iOS 14, but someone may find other use for it.
iPad Pro (10.5 Inch) (Wi-Fi + Cellular)
For other devices, please check MatthewPierson/checkm8-nonce-setter
— Mar 17, 2022