turkey3_scratch :
I actually heard from another source how they did it. Apparently, they managed to disable the feature that wipes the phone after 10 failed attempts, so once that was disabled, they were able to punch in the code until they got it right. Yes, it was someone's job to punch in a gazillion codes until it was right most likely. How fun 😛
There are only 10,000 combinations in a 4 digit code, and there are higher occurences of certain codes than others, so they'd start with most common and work their way down. One person could do it relatively quickly.
Now if it were the 6 digit code with 1 million possibilities, they still might be able to manually break it by first trying the most common codes, but if it took a day for 10,000 combinations it could take up to 100 days for 6 digits and you might want another method like a robot arm or some shit.
Nobody is actually typing in pin codes. Cute you think that is the case. (hint they would still be entering the codes the next few months). One can assume it was a modified approach to the old IP-BOX.
https://www.intego.com/mac-security-blog/iphone-pin-pass-code/