I initially thought as such too, but on a previous discussion about this exact issue on hacker news I was linked to this https://securephones.io/main.pdf https:

I initially thought as such too, but on a previous discussion about this exact issue on hacker news I was linked to this https://securephones.io/main.pdf https://securephones.io/main.pdf. Which pretty much says that a lot of your data is just stored unencrypted entirely on the phone, so the FBI is probably just dumping the info without even needing a exploit.