n1ghtshade

The tool provides a downgrade and jailbreak capability for 32‑bit iOS devices, leveraging the checkm8 exploit. It works with iOS versions from 6 through 9.3.5, allowing users to revert supported devices to earlier firmware releases and gain root access.

It is targeted at developers, security researchers, and hobbyists who need to run older iOS versions or install custom software on legacy hardware. The utility runs on macOS and requires a set of development libraries and toolchains, including arm‑elf‑gcc, libcrypto, libfragmentzip, libzip, libplist, libirecovery, libimobiledevice, and libusb when used on Linux.

The software is distributed as a stable release and can be obtained from its GitHub releases page. Bug reports are accepted via Twitter or the project’s GitHub issue tracker.