How to disable MDI (getting my Dension Gateway Pro BT unit working)

Hi all!

I've just had a Dension Gateway Pro BT unit (GWP1V21DAB) installed in the car with my Columbus, see http://www.dension.com/sites/default/files/gateway-pro-bt/en/user-guide/gatewayprobt_user_manual.pdf and http://www.dension.com/sites/default/files/gateway-pro-bt/en/install-guide/gateway-pro-bt_install_guide.pdf for more info.

The installer said I needed to disable the built-in MDI to get the Dension unit to appear in the Maxidot etc. Right now I can't see any sign of it, Maxidot or Columbus screen. :(

Can any of you tell me how to do this in VCDS? The installation guide says:

"On CAN BAP based systems (like RCD310, 510 or RNS510) the Pro emulates the factory MDI (Multimedia Interface) and Telephone option which needs to be coded since Model Year 2011. If your vehicle has not been programmed before, the Media Player 3 (2E) and Telephone (7E) options have to be coded in order for the Pro to work correctly. Please note: Programming is not required if your vehicle had those options enabled before."

I have both "Media Player 3 (2E)" and "Telephone (7E)" ... I'm guessing the last one is a typo and should say "Telephone (77)"? ... both listed as modules in VCDS.

If any of you can help me getting this working, I'd be dead chuffed!

Thanks!