Here is some info including the pinmod.
Like I said, it’s not wise to flash as you have an n4640g_v2 instead of an n4640g.
I’m not sure if the bios will work on your version at all, but if I have to guess you will need the pin mod eventually.
I saw some people use aluminium foil to connect the pins and something like electrical tape to isolate the pins.
I don’t think I will be able to help with the v2 as I’m not sure how big of a difference it is compared to the normal one.