I can't find out how to control the STB's volume via the remote. is it possible? thanks in advance!

Did you get it to control other features of the 605? What code did you use?

I had the same problem with comcast. All other features worked with the comcast remote. I went to comcast and they gave me a explorer 4250 HDC and it was the same problem. This problem is onl,y when a HDMI cable is used. It works ok with my sony tv remote.