Trying to upgrade to SSDR 1.6.21 from .17. for my 6300. Running Win7Pro on gaming grade computer. After several fails, I uninstalled everything Flex and deleted all the existing com ports using Smart CAT. (I verified ports gone via device manager). Down loaded and installed SSDR - when I start SSDR it shows no radio icon - I power up the radio and the Icon appears - BUT when I click "connect" the radio icon disappears and the it does not connect. If I power cycle the radio when it comes on the radio icon will show in SSDR for a several seconds the "connect" button is green but and then it disappears and the connect support goes out. Device manager shows Comm port 4 assigned to flex and Smart Cat shows the slice is connected to Comm 4 - I am completely at a loss as to where to go to resolve this problem. Any suggestions would be welcomed.