I am currently trying to disable the afm on my 2011 Sierra 1500 using the flashpaq f5 but the device keeps telling me "vehicle calibration files not stock." Inside the device's vehicle information it says that my truck is currently stock. I've tried several times to install the tune but I keep getting the same message. I have an aftermarket stereo installed but I pulled the fuses before attempting to use the device. Behind my stereo I also have the interfaces for my door chimes and steering wheel controls. Is it possible that those aftermarket interfaces are causing this issue because I dont really know what else to do.