Help needed: HAM2 installing Cynogenmod | Phone Locked | writing recovery... FAILED

Hi,

when i tried to install Cyanogenmod i followed the youtube video. i am new to this.
youtube video: CyanogenMod for Mate 2 Install by Super Bass

I am getting error stating that writing recovery... FAILED (Remote command not allowed). how cani fix this.
Also i see the phone is locked in the bootscreen.

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