'''3.''' Plug the RBPi4 (with the thermal block attached) on the Main Board's RBPi4 socket, the big one with 2 rows of 20 pin-holes each. Pay attention to not bend any pins.
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'''3.''' Plug the RBPi4 (with the thermal block attached) on the Main Board's RBPi4 socket, the big one with 2 rows of 20 pin-holes each. Pay attention to not bend any pins and also note that the display flat cable should pass thru the rectangle hole in the main board.