Oh thank you! I did create my own generic pcie config by modifying the repo myself, but I might’ve configured the pins wrong, so I’ll definitely try yours out. But yes, I basically copied over the M.2 config and removed stuff like the power enable and changed it to a generic pcie accessory with 8x1, that’s why I managed to get x8.
I did actually manage to get the EEPROM flashing working myself through ectool, but I’ll definitely switch over to framework tool for that.