There are pin-outs for the Mulf 2 Hi online.
And the retrofit threads cover this to.
If you have IstaD for diagnostics (highly recommended)
it has the pin outs and wiring diagram's to.
Ista D is like having a shop manual with guided troubleshooting
for just about everything and schematics and illustrations to.
If you just do search for Mulf 2 Hi BMW on the open web
a lot of stuff will show up .
https://www.m3post.com/forums/attach...0&d=1673628175
The usb has it's own Fakra connector.
This above has the pinouts for the Mulf 2 hi and combox.