The 5c still has the secret UID baked into the chip.<p>The escalating artificial delays are implemented by the OS and can be circumvented, but the secret UID is designed to make it impossible to extract.<p>Without that UID, then you&#x27;re brute-forcing a 256-bit AES key, not a 4-6 digit passcode. Practically, the brute forcing can only be done on the actual iPhone.