ADB

Android Debug Bridge(ADB) is a software which lets you have root access on your Android device, enables USB Debugging mode and what not. It operates on Command Line Prompt(CMD). In case your mobile is completely switched off and there is no way you can get your Android OS back, then this is the way forward. ADB lets you give Command Prompt through Desktop and allow you to install software on your Android device to make it functionable.

Android Debug Bridge (adb) is a versatile command line tool that lets you communicate with an emulator instance or connected Android-powered device. It is a client-server program that includes three components:

• A client, which sends commands. The client runs on your development machine. You can invoke a client from a shell by issuing an adb command. Other Android tools such as DDMS also create adb clients.

• A daemon, which runs commands on a device. The daemon runs as a background process on each emulator or device instance.

• A server, which manages communication between the client and the daemon. The server runs as a background process on your development machine.

Download the software, here.