I know these are old units and have vulnerabilities, but if they're on an isolated network, they just work. I can't recall whether slave MasterSwitches need to have firmware updated or if only the one that has the network card in it counts. Thanks!
Only the main unit with the network card would need to have firmware updated. It uses the MSP app, and there hasn't been a firmware update for quite some time since this unit was discontinued ~12 years ago I believe. Here's a download link to the latest rev:
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