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  1. The unfortunate state of iOS downgra... The unfortunate state of iOS downgrading
    1 
    Unfortunately I have some bad news for downgrading.
    2 
    Before I explain the bad news at the end of this post, I first need to introduce a background of iOS devices.
    3 
    In iOS 16, Apple introduced a new firmware component known as Cryptex1. Technically, this is a "virtual" co-processor.
    4 
    It's purpose is to allow Apple to push RSRs (Rapid Security Responses) which are separate from traditional iOS updates and can be installed much faster.
    5 
    Like other firmwares, it also has a signing ticket locked to a cryptographic nonce (number-used-once).