Originally Posted by
Steve B.
Missed that. The older Di2 11 and 10 systems need the 111 BT unit in any case.
Mine is the first generation of the 11-speed Ultegra that came out in 2014, and it is incompatible due to the battery.
With Apple's Silicon M1, M2 and M3 processors, the iOS app could work, but it doesn't. It should be easy for Shimano to tweak it to use USB; it is a pity they don't.
I got E-tube version 3.4.5 to install with Wine, but it throws a run-time error that I don't know enough to try to fix.
I found an old mac mini in the garage and going to try the boot-camp route.