You have an S905X4 or newer device. Those need EmuELEC 4.5+ for proper GPU drivers.
EmuELEC 3.8 was a significant update in late 2020 that improved performance for higher-end retro systems on Amlogic and Rockchip-based devices . While it has since been superseded by versions like emuelec 38 top
Many Android boxes require you to hold a hidden reset button inside the AV port with a toothpick while plugging in the power to boot from the SD card the first time. You have an S905X4 or newer device