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Try configuring it as an 'Xfinity XG1-A' box. That might work, rather than configuring it as an Arris if there is no Arris in the configuration.
An Xfinity XG1-A is also sometimes equivalent to an Arris MX011ANM, in case that might be available as a configuration.
As for the remote... does it have any maker or model # ***** it? does the remote actually work in any way? does it have batteries in it, that are verifiably good battery(s) ?