In practice, the modern jailbreak (for iOS 15 and 16 on checkm8-vulnerable devices) utilizes the pwndfu tool as its first-stage payload. Palera1n runs pwndfu to get the device into a compromised state, then proceeds to load a custom ramdisk to install the jailbreak files.
The iPhone remained black, but it was now "pwned." The fortress gates were pinned open. Leo could now send "iBSS" and "iBEC" files—customized components that would allow him to bypass signature checks and flash the older firmware he craved. pwndfu tool