Default What am I doing wrong?

Ok, so I odin'd to MJE...rooted MJE, installed safestrap...Booted into safestrap, installed the leaked NC2 build....Booted into download mode and flashed the firmware/radio or whatever you call it...Booted into NC2...installed the new safestrap 3.72, uninstalled the old recovery, then installed the new one...after I do that, I boot back into safestrap, and it always fails to mount system in stock slot...I find this out after I factory reset it...I have tried it twice, what gives?