Here's something I found on mobileread posted by Jim Lester over a year ago:
In ADE with the reader attached (and showing up in ADE), press the magic key incantation: Ctrl-Shift-E, and the deactivation dialog should show up
Maybe you can deactivate your reader and then reactiveate it. I know back when I got a dialog box to activate my reader (nook) when I first plugged it into ADE. Hope it works for you.
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