Versuch mal
das
Zitat:
Resolution
Possible solutions if "adb devices" shows a device as "unauthorized":
C:\Users\JohnDoo>adb devices
List of devices attached
17310D821D unauthorized
Disconnect USB between PC and device
Stop adb server by entering "adb kill-server" in command window
On device use "Revoke USB debugging authorizations" in "Developer Options"
On PC delete "adbkey" file in user directory, for example "C:\Users\JohnDoo\.android"
Reconnect the device to the PC
Open a command window and enter "adb devices". Watch the device's screen for any Authorization message and allow the connection.
The device should now show as "device":
C:\Users\JohnDoo>adb devices
List of devices attached
17310D821D device
If the above does not help, re-installing adb and or USB drivers may help.