Pocketbooks, by default, are designed to enter in "PC connection mode" by default. The problem is that the machine can't distinguish when you're connected to a power source or when you're connecting it to the PC, so it displays the message anyways. You can change what happens when your PB gets plugged in the Settings menu. You can choose between the standard mode (PC connection), charging automatically, or have the device ask you if you want to use the PC connection mode or charge mode.
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