Yeah, apparently uverse standard black remote will not support the Bose Cinemate GS. My Bose system was new in 9/11 btw. Less than 2 years old. I've messed with it most of the day, tried everything in a similar thread to this one I started, found more codes (and NO 4000 does not work) and so on plus factory reset of the uverse remote, blah, blah, blah. I also had the same thought as another guy - use the BOSE remote to control uverse, but like 1 post said. No code for uverse available.
I'll also mention I had an AT&T guy here today on another matter and got him to mess with it - to no avail. Looks like the Harmony remote (Radio Shack?) is my last option other than contact Bose maybe. If anybody ever figures this out, sure hope they post the solution.
Bose's Cinemate Series II GS owner's manual.