Can't find anyone else in this thread with my situation. I have a 2015 silverado with 8" screen without navigation. I just want the Android Auto and Apple CarPlay to work. Do I need to upgrade to the 2.5 hmi or just get my radio module updated by a dealership? I have the text application on my radio already if that helps, I think I saw someone say that tells you if you were a late or early build for that 2015 year. Thanks for any help!