How to solve ADB device unauthorized in Android ADB host device?

Question

When I\'m using a rooted Android device as ADB host to send adb command \"adb devices\" to Samsung S4, I received device unauthorized error message. However when I tried adb

Answer 1

Have you tried

adb kill-server
adb shell

Sometimes adb gets stuck and first killing adb server and then starting some command forces authorization window to pop-up.

Also please check adb client version on your phone. THis feature is supported from adb 1.0.31 as far as I remember.