Which Bloomin' AMI Lightning Cable?!?!?

[Turbo Tony]

I'm going crazy buying AMI cables at the moment. My 2008 S8 has MMI 2G and the older style AMI, with the little pocket to fit the device.

Before I bought the car, I bought a pack of two cables - a USB and a lightning cable. The USB works fine with a USB stick, so I'm confident the AMI is working but I wasn't so lucky with the lightning cable. It has a yellow collar/sleeve and it charges my iPhone 6+, but I get a message on the MMI display saying either the cable or device is not compatible.

OK, I've bought the wrong cable, I thought. After an evening of searching, I found that the Lightning cable with the while collar is the one I need. Shame, as it was a lot more expensive, but I took the plunge and bought it. No luck there either - this time the phone didn't even charge and there was no message on the MMI screen. It was like there was nothing plugged in.

Finally, I thought perhaps it was better sticking with cables that were made at the time the car was built, so I bought a 30-pin apple cable from eBay. It was in the seller's car but never used because he had a phone that required a different cable. To go along with this, I bought the official Apple 30-pin to Lightning adapter cable. No luck with that setup either - it behaved just like the white collar cable with nothing on the display and no charge to the phone.

So now, I'm exasperated. I've spent over £100 on cables and still don't have a working AMI.

Does anyone know what the proper cable I should be using? There are only two options left - the green and the black collar but I'd rather not complete the set before finding out which!

Also, did I miss a step somewhere? Do I need to do anything to register the cable with MMI? I did a reset with the last cable but none of the others.