I just bought a 09 LT Silverado with factory single disk cd/mp3. I'd like to switch it with a factory 6 disk cd. I know the older trucks had to have the BCM flashed to work with a new (different) stock radio. Is that the case with the 07+ as well? Naturally I'd like to just switch them out in my garage one evening and have everything work but my luck it isn't going to be that easy.