Thanks, I'm going over the thread now trying to get a grasp on exactly what I have to flash. I think I get it all except for this step.
Your bootloader stack should be on MM 20p or higher! (see FAQ #20 for how to upgrade your bootloader stack)
I have flashed the baseband package from the USU thread titled "H815_UsU_baseband_flash-in-twrp"
So can I just flash the N modem? How do you clean flash the modem partition?
This phone has always been 6.0.
Thanks to anyone that can help.