Swap USB/Aux to MDI on MIB1 Amundsen, what coding changes?

I originally posted this in the Octavia III Forum - but after 53 views and no replies thought this might be a better Forum...

I'm trying to replace the USB/Aux In connections on my 2015 Skoda Octavia III (MQB) with the MDI input. It's fitted with the MIB1 Amundsen infotainment unit (5F).

I've got the hardware I need (new lead from MIB1 to MDI socket, MDI socket and centre console trim) and the lead came with a coding instruction that said to set Bit 5 of Byte 8 in the 5F coding.

I've just looked at the 5F coding using VCDS 16.8.4 and that coding change doesn't look right to me as there's no information in byte 8 for bit 5 but there are bits in other bytes that refer to changing the USB functionality to add iPhone compatibility.

Can someone please advise what the correct coding changes are to enable MDI functionality (maybe someone who has a MIB1 Amundsen with MDI can share their coding?).