Update 03/2018: According to comments below it seems that access to the Boot menu was blocked by Huawei. Please take this into consideration if you plan to buy a new Matebook X (and correct me if I am wrong).
If you have bought the Matebook X (which comes with the Windows OS) and you maybe plan to install Linux, you will ask yourself how to do this. In this blog post you will learn how to enter the BIOS and the boot menu.
I have been through this installation process for Manajaro Linux (based on Arch Linux) and would like to share my experience.
Entering the Boot Menu in Matebook X
To enter the boot menu, start up your Matebook X and hold the F12 key. To install a different OS from USB you will need to disable secure boot inside the boot menu.
Entering BIOS in Matebook X
To enter the BIOS menu, start up your Matebook X and hold the F2 key.