I have worked through the thread @andyboeh linked. I unfortunately could not get past the wrong file error despite downgrading stock, using @netadair's fixed versions (17.01.4 and 18.06.1) and changing the file name.
Is it possible the electrical plug/region type matters? I know TP-Link have different stock version of the firmware based on region. I am using the US version and the screenshots and links I've seen suggest you guys might be using the EU version? The hardware ID (0x86310001) seemed to be more complicated than just model and version.
I ask in this thread for continuity as well as possible relevance. It would be a consideration for V2 images as well right?