FTGA is the contact technology used in G40M i.MX8M Plus OSM SOM designs. Although component pads are present on the underside of the board, but no components will be assembled there. Kindly connect with iWave representative for 3D STEP file.
For further inquiries, please get in touch with mktg@iwave-global.com
Please find the detailed G40M product information in the below link,