I know it's recognized on my computer, because I have the computer set to open the Fire's "files" when it's connected, which it does. But there's no icon to show the Fire is connected. Calibre is up to date.
Is the Kindle Fire in data transfer mode?
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How do I get Calibre to recognize my kindle fire?
With the Kindle Fire 8 or newer there is an icon that shows up when the USB cable is plugged in, showing that the device is charging. Tap that and switch the device to data transfer mode, and then start calibre, it should then be detected.
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