Finally got through to the customer support line and according to them the T1000 is no longer able to get the required updates to support any 17 and newer GM vehicles. My only options are to sell it privately or to trade it for 25% off the purchase of a new tuner from them.

Any idea how much it costs for that ecm unlock code? Didnt know that was a separate purchase after spending that much in a tuner....

Got a 2018 Silverado and went to update the t1000 to the newest firmware and it would keep stalling while trying to do that. The last time it seemed to go almost all the way through. I thought I'd try it and see if I got lucky, but when I hook it up to the truck and select Chevrolet 2018 silverado 5 ...