Fastboot mode flash

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Jul 7, 2018
Hello guy plz u have unbrick my k8 note and now stuck in fastboot mode so how i can flash it i tried many frimware but no success

ommand : fastboot flash boot <file.img>
this error pop up :faiLED (remote: can't flash unsigned image) bootloader is locked how can i unlocked it . I couldnt unlocked it failed

I want to be back any version orio or 7 nougat

Best regardd ..

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