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Axpert 5kva... can firmware be updated with USB cable provided


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No, you can't use USB unless you have a model that has only USB. I think it's just laziness on  the part of the manufacturer, but that's the way it is.

5 kVA models have the RS232 port, and you have to use it. So yes, you'll need the serial to USB adapter, or an rare Windows computer with a built-in serial port.

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