Bootloader Lock Procedure

[thinkbig]

Hi, I followed this guide to install the stock ROM, and I managed to load it, but now I'd like to know how to lock the bootloader. I tried the cmd prompt command, but I can't figure it out. Can anyone help me?

https://xiaomi.eu/community/threads/how-to-install-stock-rom.74017/#post-734380

 

[ciubex]

What it is displayed when you type below command and have your phone connected to the PC in Fastboot mode?

fastboot devices