Trawling through HDFORUMS in a post on 15th Feb 2020 (
https://www.hdforums.com/forum/milwaukee-eight-m8/1252410-19-m8-boom-gts-carplay-hack-22.html) the question of whether the microphone switch off facility had been disabled in the latest BoomBox GTS updates is answered.
This is quoted from the HDFORUMS:
The option to disable the mic is still available in Digital Tech. I had a defective GTS radio that had to be replaced. We first updated the radio to the latest software, including POI updates and then were able to plug it into to Digital Tech to disable the microphone. We did this two days ago.
Whoever is telling you that Harley disabled the option in Digital Tech is not being straight with you. The option to disable the microphone in Digital Tech is found on the Accessories tab of the software and the options are wired, wireless, none, and disabled. All you have to do is set it to disabled. As soon as you plug in your phone, CarPlay pops right up.
UNQUOTE.
Can anyone on CVOHARLEY confirm this as I havent updated the BoomBox nor am i in a position to do so as I am out of the country at the moment.