Case: You connect your Android phone to your computer, run the command 'adb devices' and your device is unauthorized. Even if you authorized the device. Requisites: Android phone, USB cable, computer with Windows and adb installed. Steps: Make sure the phone is not connected to the computer. Remove the previous authorizations given into the phone. Kill the adb server. Remove the key files. Connect the phone to the computer with the USB cable. Run the command 'adb devices'. In the phone, accept to give the authorization. Results: When you run the command 'adb devices', it will show your devices with the status 'device' instead of 'unauthorized'.