Just keep going till you find a dealership that WILL do it. It took them less than an hour to do mine. You just have to find the right service rep. Print that off and take that to them and have them look up the exact bulletin in their system because it's there! The only caveat I would see is that if you're enhanced view shows the picture of the ZR2 and not a suburban or Tahoe or high country, then they might not do it and tell you that your system is properly programmed. The two dealerships I took it to prior to getting it done correctly showed a Tahoe and a Suburban after they got done programming it. So when I finally got it to the dealership that programmed it properly, the service rep stated in the notes that it was not programmed correctly and they installed the right one.
He also told me that if it shows a Tahoe or a suburban or a high country, the suspension and the engine are programmed to that model type and would not tune the engine or the suspension to the proper programming for the other two off-road modes or even the regular two wheel drive mode. That's why it was such a big issue for me. Hope you can find a dealership to do it properly.
