After I installed the new F/W into my XPR6500, and wrote once, now I can not read or write to the radio. No communication at all. i keep getting an error message that says 1687 Unable to detect applicable devices. I'm scratching my head. i uninstalled the CPS and reinstalled it and even did a system restore to see what that would do. Ran just fine before the F/W upgrade to R1/9/10.