I'm waiting since two years now to have support for GMC Sierra 2500 2011-2012
in each update i hope that the problem will be fixed but it seems it will take decades :(
I attached picture for the message i have when i tried to read the tune file from those cars in the attachments
i have the latest updates and firmware 7.5 build 206 & 8.2 build 197
this is the VIN : 1GT029CG7BF181024
please help