1. Remove the bottom protection plate of the Mega;
2. Remove the SD card adapter board and cable, SD card holder fixed board, please take note of the strength when taking the SD card adapter board;
3. Insert the SD card adapter board into the corresponding PIN pin and wire it according to the original line;
4. Install the SD card holder fixing plate and tighten the screws;
5. After confirming that the wiring is installed correctly, replace the base protection board.