How to enable USB debugging on Android

USB debugging’. 
Enabling USB debugging is the first step required before you start installing custom ROMs, rooting, or any such hackery. Best of all - enabling the setting is extremely simple and quick, and in fact, you can do it in less than a minute.

Before we start, though, let’s just clarify what USB debugging is. A feature aimed mostly at developers, USB debugging opens up direct access to the Android system for the Android SDK (Software Development Kit). You can have the Android SDK downloaded on your computer, but unless you have USB debugging enabled, it won't work with your device. With all this in mind - whether you are a developer or someone who has decided to flash a custom ROM, or simply root your phone - here is how to enable USB debugging on different versions of Android:

KitKat and Jelly Bean (4.2 and later)
1. Navigate to Settings > About Phone > scroll to the bottom > tap Build number seven (7) times. You'll get a short pop-up in the lower area of your display saying that you're now a developer.



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