Then I'm at a loss.
Try this: connect your Iriver to the pc as above, and in Calibre go in and choose preferences, wherever that is on your pc. If yours mirrors mine, at the bottom of the list there is a choice of Advanced, containing Plug-ins, Tweaks and Miscellaneous. Choose Miscellaneous, and the first one on my list is Debug device detection. I don't know what it does or how it works, but press that and let us know what happens.
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