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I've never upgraded a focuser, but I'm sure there will be gurus here than can help. If you have it accepting commands suggest try to follow the SGP instructions for auto-focus and see if you can get parameters that work.
If you're not desperate to have automatic unsupervised operation probably no reason you couldn't use the "calculate HFR" option to focus manually to very good precision. Would be surprised if your critical focus zone on the ED80 is overly tiny, which helps a lot.
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