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Make sure your image is newer than Sept 14, 2018 as that is when the overlay was added: https://github.com/beagleboard/bb.org-overlays/blob/master/src/arm/BBORG_GAMEPUP-00A2.dts
sudo sed -i -e "s/#?uboot_overlay_addr0=.*$/uboot_overlay_addr0=\/lib\/firmware\/BBORG_GAMEPUP-00A2.dtbo/;" /boot/uEnv.txt sudo shutdown -r now