How do I Unbrick a device?
If it is definitely hard bricked, then you may be out of luck. A few phones can be revived with a USB Jig, a tiny device that plugs into the USB port and puts the phone into Download Mode to reinstall the stock firmware.
Bricking a device is most often a result of interrupting an attempt to update the device. Many devices have an update procedure which must not be interrupted before completion; if interrupted by a power failure, user intervention, or any other reason, the existing firmware may be partially overwritten and unusable.
Causes of Bricked Android Devices A device that will not power on at all is hard bricked. A soft bricked device may boot into recovery mode or freeze at the start-up screen.
As a basic rule of thumb, if you can turn on or off your Android, you're dealing with a soft brick. Unfortunately, there is nothing you can do if your Android has been hard-bricked.
But if you do, you might risk your own mobile security. Here's why: You can turn your smartphone into a brick. Not literally, but if you goof up the rooting process, meaning the code modifications, your phone software can get so damaged that your phone will basically be as useless as a brick.