Comments
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Many thanks Jonas for your answer.Shame on me!! 'you'll need to unzip the file first' is the relevant part of the topic.Now I can manage the switch within the lan. Sorry for the noise. My best regards
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I partially answer by myself. With the same configuration a TP-Link switch is working as expected so maybe my Zyxel device, by bad luck or by design, is faulty.As I can't even upgrade the firmware Is there any other test to do before send it back to Amazon? My kind regards