How to fix: Error device not found with ADB.exe

Question

In cmd when I try to do the command:

adb shell

it shows device not found error. Can someone help me please. It'll be appreciated.

Answer 1

Don't forget to go to your device and enable Settings->Developer Options->USB debugging.

Answer 2

Try any of the following solutions. I get errors with adb every now and then. And one of the following always works.

Solution 1
Open command prompt as administrator and enter

1. adb kill-server
2. adb start-server

Solution 2
Install drivers for your phone if you're not testing on emulator.

Solution 3
Open android sdk manager and install "Google USB Driver" from extras folder. (attached screenshot)

Android SDK Google USB Driver missing

Solution 4
Go to settings > Developer Options > Enable USB Debugging.
(If you don't see Developer Options, Go to Settings > About Phone > Keep tapping "Build number" until it says "You're a developer!"

Enable USB Debugging