It’s doubtless that the system is now not approved on ADB for no matter motive.
1. Check if approved:
<ANDROID_SDK_HOME>platform-tools>adb gadgets List of gadgets connected 4df798d76f98cf6d unauthorized
2. Revoke USB Debugging on telephone
If the system is proven as unauthorized, go to the developer choices on the telephone and click on “Revoke USB debugging authorization” (examined with JellyBean & Samsung GalaxyIII).
3. Restart ADB Server:
Then restarted adb server
adb kill-server adb start-server
4. Reconnect the system
The system will ask in case you are agree to attach the pc id.
You want to verify it.
5. Now Check the system
It is now approved!
adb gadgets <ANDROID_SDK_HOME>platform-tools>adb gadgets List of gadgets connected 4df798d76f98cf6d system