I have Lenovo YOGA Tablet 2 830LC X86.

Rescue and Smart Assistant tool is a software to work with this tablet.
When i activate USB-Debugging in tablet i face the error below in Rescue and Smart Assistant tool.


Unauthorized is because after activating USB-Debugging mode in tablet and connecting my tablet to PC, there is no popup asking me if i want to trust this PC, which i have to agree (permanently).

By deleting the adbkey file found in C:\Users\[Username]\.android folder the permission dialog did n't appear on my device.

What should i do to fix this issue?

Edit after comment :

  1. I am using USB charging cable.
  2. I have windows 7
  3. USB OEM driver for Lenovo > When i connect lenovo tablet to pc a pop up shows up on pc to install usb driver.
    So i installed it & after that i can see tablet folders.
    But i did n't install any other things.
  4. Have you reset the USB authorization on the device too (usually inside Developer options) > Is this your mean revoke USB debugging authorization? If yes i did it several times.
  5. Is the device detected by ADB (call adb devices on command prompt)
    I found a adb.exe in this path : C:\MagicPlusMini\app
    After enter adb devices command it founds : Baytrail6F284E37 offline
    I found another adb.exe
    Here is the command prompt :
    C:\Program Files (x86)\Rescue and Smart Assistant>adb devices
    List of devices attached adb server is out of date. killing...
    daemon started successfully
    Baytrail6F284E37 unauthorized
  • I would delete all those old adb versions and use the one from Android SDK. Multiple adb versions in one computer only make problems or replace those versions with the one from Android SDK.
    – Robert
    Commented Apr 17, 2021 at 20:37

1 Answer 1


Possible solutions if adb devices shows a device as unauthorized:

C:\Users\JohnDoo>adb devices
List of devices attached
17310D821D > unauthorized

  1. Disconnect USB between PC and device
  2. Stop adb server by entering adb kill-server in command window
  3. On device use Revoke USB debugging authorizations in Developer Options
  4. On PC delete adbkey file in user directory, for example C:\Users\JohnDoo\.android
  5. Reconnect the device to the PC
  6. 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.

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