Need someone to help or advice. I have a 2016 Forester stock Headunit (HU) which is not working. Can I upgrade to the later stock HU (late 2016) - I enclose a picture of the two (Old HU is above). Everything seems to fit physically. I tried to do plug in and everything worked except that the usb cable and rear camera. There are also a few more connectors in the new HU vs the old HU. Is there anyway that I can get the rear camera fuction working (setting or wiring maybe ?) and USB. Appreciate comments and help. Thanks in advance.