failed ( Remote: Command not allowed ) in fastboot of HUAWEI Y6 II( CAM-L21 )

[nkoxvip0]

My phone (huawei Y6 II CAM-L21 ) has been bricked and I tried with fastboot to flash the system.img file boot.img recovery.img.) But all are error messages: failed Remote: Command not allowed.
Who can help me please guide, please !!!!
I am Vietnamese and have used google translate to translate this text, if there is wrong please try to understand it to help me, thanks

 

[Amaan007]

Yo u need to unlock ur bootloader

 

[nkoxvip0]

Yo u need to unlock ur bootloader

my devices unlocked before brick.

 

[Valkenburgh Margin]

Shutdown your device. Plugged in your device to whatever you're using laptop or pc. I know you have installed your adb and fastboot cuz you have unlocked your bootloader. Connect to pc --> Press volume down button + power button till it gets to fastboot and rescue mode --> Flash system.img, boot.img, recovery.img.

 

[Amaan007]

Shutdown your device. Plugged in your device to whatever you're using laptop or pc. I know you have installed your adb and fastboot cuz you have unlocked your bootloader. Connect to pc --> Press volume down button + power button till it gets to fastboot and rescue mode --> Flash system.img, boot.img, recovery.img.

Plz help like I did to u thx

 

[nkoxvip0]

Shutdown your device. Plugged in your device to whatever you're using laptop or pc. I know you have installed your adb and fastboot cuz you have unlocked your bootloader. Connect to pc --> Press volume down button + power button till it gets to fastboot and rescue mode --> Flash system.img, boot.img, recovery.img.

failed remote command not allowed
: Khóc:: Khóc:: Khóc:: Khóc:: Khóc:

 

[Amaan007]

failed remote command not allowed
: Khóc:: Khóc:: Khóc:: Khóc:: Khóc:

Update ur fastboot drivers

 

[adam_s_459_]

I only get that error when I try to Flash imgs like logo.img or misc.img and stuff like that. Flashing system and boot works fine for me