I have the same problem my 2012 silverado 4x4. K series is identified as a Chevy volt , I have sent the information a month ago but still no software to fix this and like you said when I first got my ds -708 the software in it worked not sure what version then I updated software to version 11 and now it's messed up sees my silverado as a Chevy volt . Nice so now I keep all old versions of software on sd cards just in case ,wish I had the old version of software that came with the ds-708.
Don