I use to know those details on the hardware and what was the issue with the 15's... but I forgot.
Here is what I think I remember on the 15. The PRO ABS code does install on the hardware there, but, there is some limited function of it. Maybe, it was the USER mode. Seems like you could not do ABS in USER mode like you could in the 16's that came with PRO ABS.
I do know that there was an updated ABS released in all 2016's made after June 2016 and those unit also started getting ABS PRO as base coding, and no enable was needed.
2020 K67 ///M Programmed XWORKS ECU by me
2018 K46 RCK3 / HP Power Kit'ed ECU by me
2017 K46 RCK3 / HP Power Kit'ed ECU by me
2015 K46 RCK3 / HP Power Kit'ed ECU by me
2014 K46 RCK2 / HP Power Kit'ed ECU by me
Thanks to MotoMillion.com for the support and selling my programming
PM me for any tech support and feature details on XWORKS ECU's