Android ADB devices unauthorized

Solution 1:

1. Try Revoke USB DEBUGGING Authorization.
2. Enable USB debugging again.

It worked.

Solution 2:

Thankgod xda developers exist : http://forum.xda-developers.com/verizon-lg-g3/help/unable-to-access-adb-t2830087

Just had to delete adbkey file in C:Users/$Name/.android adbkey.pub was missing.

Restart after this and both files are there.

If this does not work : - Try Revoke USB DEBUGGING Authorization. - Enable USB debugging again.

Solution 3:

In sequence:

    adb kill-server

• in your DEVICE SETUP, go to developer-options end disable usb-debugging

• press REVOKE USB debugging authorizations, click OK

• enable usb-debugging

  adb start-server