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I had a quick look on Google and there are numerous reports of problems with ereaders connecting via usb after various updates. I use Linux and the only similar problem I have ever experienced was a Kobo which was very sensitive to the type of USB cable used.
One thing I saw suggested which apparently worked for some is to connect the reader through an old usb hub. Not the best solution but if it works may get you out of trouble until a fix comes along. I also saw references to a usb troubleshooter which may be worth following up. Another suggestion was to re-install the Windows software for your device, if it shipped with any. The theory is that it may re-install necessary drivers. I'm not sure about your particular readers. Kobo, for instance, has its own desktop software, whilst Kindles do not.
Good luck.
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