Inferius is an xpwn-like tool, written in Python, which can create custom IPSWs with firmware bundles & restore 64-bit devices using a custom IPSW.

Its current purpose is to downgrade devices (vulnerable to checkm8) to previous iOS versions. However, there are other possible uses for this tool as well.

Before using Inferius, keep in mind that

• No one but YOU is fully responsible for any data loss or damage caused to your device
• Creating a new IPSW when attempting to restore is a must when using Inferius. Previously created IPSWs can brick your device, depending on which LLB and iBoot files were used from a signed firmware
• Restores are not untethered. This means that in order to boot your device, you're always required to use PyBoot or ra1nsn0w to do just that (or if you want to boot jailbroken, checkra1n will work fine too)
• Downgrades are still limited to versions compatible with the latest signed SEP version. This will change when checkra1n recieves a SEP bypass

Inferius may not come with a firmware bundle compatible with your device. If you need to create your own firmware bundle, you can follow this guide.

Pull requests for new firmware bundles are welcome, as long as the firmware bundle you want to add can create a usable IPSW for the targeted version.

Currently, to use Inferius, you'll need

• A computer running macOS (Linux support may come in the future)
• At least 10gbs of free space on your computer
• An Internet Connection
• A 64-bit device (vulnerable to checkm8)
• A firmware bundle for your device & the iOS version to be downgraded to
• A brain (Not completely necessary, but YMMV)

To create a custom IPSW with Inferius

pip3 install -r requirements.txt

./inferius.py -d 'device' -i 'iOS Version' -f 'IPSW' -c [-v]

To create a custom IPSW with Inferius and restore the custom IPSW onto your device

./inferius.py -d 'device' -i 'iOS version' -f 'IPSW' -c -r [-v]

To restore a custom IPSW onto your device

./inferius.py -d 'device' -i 'iOS version' -f 'IPSW' -r [-v]

Below, you can find all the options Inferius has to offer

I'd like to thank the following individuals for their corresponding role in this project

• NotHereForTheDong for providing firmware bundles and beta testing
• Renaitare, Chibibowa, and Moses for beta testing
• Matty for his special build of futurerestore, which allows custom IPSWs to be used for restoring

Finally, if you need help or have any questions about Inferius, join my Discord server.