It's been running this build for a while. However, he was on it today, and it crashed. Now it won't even try to boot unless you take out the battery and put it back in, in which it will show the samsung logo and shut off. It won't boot into recovery, it won't boot into download mode.
I'm thinking it's hard bricked, but why would it randomly hard brick itself like this? And is there any way to fix it?