Any way to upgrade Dual XDVD8281 in-dash car radio?

[johnny13oi]

Hey guys, does anyone have any schematics or something of the pins and stuff on the Dual XDVD8281? I would want to make it accept SD cards which I believe I saw some contacts on the board for another connection and was wondering if anyone knew how to do this. I think it would require hooking up the physical SD card slot itself and flashing the firmware. The firmware I think I would need would be the firmware for the Dual XDVD8285 which appears to be the exact same as the one I have but with that module, bluetooth module and ipod controller. I opened it up once and the inside was very empty and a lot of room left.