Ok, so I followed instruction to the letter. I wiped everything twice.
I flashed the ROM.
When I go to reboot from TWRP it says OS not installed.
system.img is still not flashing, according to recovery log.
What's going on here? I flashed the Oreo firmware from the OP, so it's not that. What else can I do?
MD5 checks out, so it's not a corrupt download. I even created an MD5 file for TWRP to ensure the file on my SD card wasn't corrupted, and it matched to while flashing.
So why would it fail to extract the system image? Partition issue? I was running the Renovate Note 8 port prior to this, but that should make no difference right?