Default [Q] Which bootloader do I have?

Is there any easy way to tell without being able to boot fully? There isn't anything immediately obvious on google. I'm trying to help out a friend, his phone doesn't get past the boot animation anymore and he doesn't know which version he has. I can boot into download/recovery modes but don't see anything that screams MF3, MK2 or any of the others.

Updates: I can get to sideload but don't know if I can install any Roms through sideload without a custom recovery. The recovery right now is stock 3e I think.