Devialet 170 companion

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I have a feeling that 10.1 is the last firmware that will run on a non-Pro/CI Expert., but it's important to match the firmware between the two units so I'd start by checking what you have on your current 200. It would be worth checking with Devialet to make sure you can update in one stop from whatever is on the 170 to the version you choose.  There is a firmware archive on this site (DC) which goes back to v6.0.x so hopefully you'll find the right version there.