How to Enable USB Debugging Mode on Android

The ways to enable USB Debugging mode, which is accounted for the key step in Android rooting process, vary from one Android version to another. USB Debugging is required by adb, which is used for rooting, backing up, installing a custom ROM, tacking screenshots from computer and more.

For old android such as 2.0-2.3.xx

Settings > Applications > Development > USB Debugging.

for 4.2.xx and higher 

First, you need to enable "Developer Options Menu

1-Click Menu button to enter into App drawer"

2-Go to "Settings"

3-Scroll down to the bottom and tap "About phone" or "About tablet'

4-Scroll down to the bottom of the "About phone" and locate the "Build Number" field.

5-Tap the Build number field seven times to enable Developer Options. Tap a few times and you'll see a countdown that reads "You are now 3 steps away from being a developer."

6-When you are done, you'll see the message "You are now a developer!

7-Tap the Back button and you'll see the Developer options menu under System on your Settings screen

Now, you can enable USB Debugging mode

8-go to Settings>Developer Options>USB Debugging. Tap the USB Debugging checkbox

last Android 5.0 lollipop

1-Settings > About Phone > Build number > Tap it 7 times to become developer"

2-settings > Developer Options > USB Debugging.

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