I’m posting this because the process wasn’t as straightforward as it did for Intel macs where you could simply use precompiled packages or run brew install libimobiledevice. Here is what I did:

1. Install Xcode from App Store

2. Install Xcode command line tools

sudo xcode-select --install

3. Install Homebrew

/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install.sh)"

echo 'eval "$(/opt/homebrew/bin/brew shellenv)"' >> /Users/manatails/.zprofile
eval "$(/opt/homebrew/bin/brew shellenv)"

4. Install required tools

brew update
brew install --HEAD usbmuxd

brew install --HEAD libimobiledevice

brew install --HEAD libirecovery

5. Use libimobiledevice to collect necessary information

ideviceinfo // get device information

ideviceenterrecovery (UniqueDeviceID from ideviceinfo) //put the device into recovery mode

irecovery -q //you can get NONC and ECID from this command

irecovery -n //return your device to normal mode

6. Back up blobs using TSS Saver: https://tsssaver.1conan.com/v2/
Input your ECID and apnonce(NONC) and you’re done.

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I also kept getting strange zsh: process killed message when I first started any of the brew packages, but I fixed it by completely uninstalling brew using the uninstall script then removing the installation folder, then reinstalling homebrew.

/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/uninstall.sh)"
sudo rm -rf /opt/homebrew

I also recommend saving the entire output of ideviceinfo and irecovery -q command somewhere just in case.