There’s no one direct approach. The method to be employed depends on how your bricked Android device is acting. Some methods are:
Unbricking by flashnig stock ROM: If you have access to the Stock ROM, then boot into recovery mode and flash it.
Unbricking an Android device with just one click :There’s now an easy and convenient way to fix a bricked Android device with just one click. Simply download OneClick Unbrick . It is a cross platform app so it should work on a wide range of devices.