[nunorsilva]

Well, I also have this problem; sort of.
Unfortunately I've bought all the items (emulator, camera, wireless modules - I don't want to have to take the wire from the rear to the front of the car) after I've searched through the Internet. On the other hand, luckily I've done the search before trying on my E61.

As far as I've researched, there is no E60 or E61 with OEM rear view camera; as odd as it seems, there is no such option and therefore SA code 3AG is not valid for E60 chassis. No way around this. The option is not available.

For me, flashing E70 gw would be an option only if there were no loose of functionality. Because that is not possible I've solved my problem by buying a RVC dedicated interface. Much more expensive but much more simpler.

As for the E9x/E60x compatible Chinese modules, I'm on a dispute with the seller because he says that it works on E6x with 3AG service code and that is not true. They are cheating and lying about that. My suggestion it that all do the same so they stop telling that it works on E6x.