[nfriedly]

The iPhone 8 has the unpatchable checkm8 bootrom vulnerability, so while it doesn't say this in the article, the author could have jailbroken the device to run whatever software they want without paying any Apple fees.

That vulnerability was a huge win. It just recently stopped, with the final vulnerable device (7th gen iPad) not getting the iPad OS 26 update.

[selcuka]

Isn't it an in-memory exploit, though? I believe it would stop working if the phone restarts for some reason.

[nfriedly]

Yes, that's correct, it's "tethered" meaning you have to basically redo it each time the phone restarts.