Video that shows how to revive a mobile in this case Huawei or any mobile since the command processes are very similar, with fastboot commands …
EYE: This method must be done in case the official methods do not work. In some brands or almost all open to have the bootloader unlocked.
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MINIMAL ADB-FASTBOOT – http://goo.gl/LSN2mS
ADB GOOGLE GENERIC DRIVERS – http://goo.gl/7Rbfrq.