Ok! So, I finally managed to disable NVDIA GPU. Please check the screenshot.
However, now, I'm back to 7MB memory thing
I've attached my config.plist as well.
Also, until Sierra 10.12.6 I used a patching script for Graphics from Insanelymac (. It worked fine until now. However, now even after patching the 2 kexts, that is 5000 and framebufferazul, it's not working. What should I do?