Nintendo DS Flash SD Card, GBA Games not working

The DS Lite, as most people probably know, comes with a placeholder gba cartridge that nintendo officially calls the cartridge slot cover

slot 1 warioquest with the slot 90 micros from each respective saves right after the mona sampling and the warioquest making, as slot 90

nintendo ds slot 2 So I l'm curious as to why my DS Lite's GBA slot cover has gold pins on it, if it's just a dummy cartridge to act as a dust cover and to

nintendo ds gameboy slot DS, like the Game Boy Micro, & the DS Lite do not feature backwards compatibility for GB