There's been a number of ways to bypass a locked iOS device throughout the years[1]. This hardware box worked up until iOS 11 beta[2]. I imagine Cellebrite is using something similar, but gets around the fix Apple released.

[1]https://www.youtube.com/results?search_query=everything+appl...

[2]https://www.youtube.com/watch?v=IXglwbyMydM

These devices allow you to perform a brute force attack.

Jailbreak requires a reboot of the device and after a reboot the encryption key for the useful data on the device is not available. If the device uses a strong passcode (as opposed to a numeric code) it cannot practically be brute forced even if you force the device to allow you to enter many attempts quickly.

This is exactly why I use an XKCD style multi-word password for my phone. TouchID/FaceID keep me from having to enter it a lot and the rapid pressing of the power button to disable it give me convenience without significant compromise.

Good but do throw a random character in there, otherwise your passphrase is essentically a few characters long in a (larger) alphabet—ie, a dictionary sorted by most frequently used words. Or at least use some uncommon words.

    70^8   = 576480100000000   // 8 chars of upper/lower case, numbers, symbols
    4000^4 = 256000000000000   // 4 words pulled from a vocabulary of 4000 words

    word          rank
    ------------- ----
    correct       1808
    horse         1286
    battery       3221
    staple        (not in the first 4000)

https://xkcd.com/936/ (For those who were wondering about the context.)

> Good but do throw a random character in there

There is, but that part isn't the important part. The important part is using a long pass phrase rather than a multi digit number.