We are installing the new upgraded Harley Boom Box GTS Infotainment System in my 2014 Street Glide Special that has the older Boom Box 6.5 GT unit. We already have a complete install video on how make the swap.
The older GTS Boom Box Units (Part #'s 76000779 Street Glide and 76000783 Road Glide) software does not recognize 2014 to 2018 bikes.
The newer Boom Box GTS units (Part #'s ending in A or B) will recognize 2014 to 2018 bikes. So, the work around for installing an older Part # unit is to put it in a 2019 or newer bike and update the software to the latest version. It can then be installed in a 2014 to 2018 bike.