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@ngocle92dn Yup, you need to connect the USB.
You also need to enable "USB debugging" in the settings.
The "adb devices" is the next thing to do to make sure that you're connected.
Once you get used to ADB you'll find everything much easier.
I use AdbSync (another program, not to be confused with "adb sync") to quickly get all my devices to have the same books and content and at the same time to download all the photos from things with cameras.
But that's another subject for later.
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