No errors in Device Manager is good. It would be interesting if the Control Panel program works but the Clone Utility still fails to connect to the radio.
It's been a while since I've programmed my DJ-X11, something which I always do using the Clone Utility and never via the radio's front panel, but I seem to recall that there are a series of radio buttons at the top of the screen in the Clone Utility where it's necessary to choose the particular model of the radio (E, T, J, K, etc.) that you've got connected to the computer. I don't think that the computer will be able to talk to the radio unless the correct model is selected. Selecting the correct model is probably the first thing that you should do after launching the program. In my old 2.03 version of the program, the setting is not remembered (retained) across launchings of the program and must be selected each time the program is run.
As I recall, you'll also have to select the COM port number that has been assigned to the ERW-8. In my case it's COM4, but yours may be different. If an incorrect COM port number has been selected in the program, even if just by default, the computer will fail to communicate with the radio.
In Device Manager, I've got settings of 9600 bps, 8 data bits, no parity, 1 stop bit, and no flow control. I'm not sure if it matters, but you might want to check your COM port settings in Device Manager.
I applaud your ability to program the radio through the front panel. For me, I'll stick to the Clone Utility.
As to the RF Gain setting, my radio is set to a value of 1, which I believe is the factory setting. I've never tried changing it.
Again, good luck with this, and do try the Control Panel program.
Regards,
Frank.