Something we are missing here is a map.. I'm using a 150version (x1xx series) firmware. I will ignore the version. I'm trying to create the start of a scatter chart here. Add more information as it is discovered... Actual partition names, locations in /dev/block, EMMC layouts.. that sort of thing. Eventually we will blow this thing wide open for modification, but we have to start by mapping it out.
This man has fixed, and helped fix SO many things. So glad to see your name in here working on this. It shouldn't be long now.