Flashing Instructions

Unlocked the bootloader of you device (there are pretty much guides around XDA, go give a check)

A working usb cable

A computer

platform-tools installed (v32 or above)

A backup of your data

A brain (jk, but, make sure you know what you are doing)

Let's begin :D

Download the zip

Boot into Bootloader mode (hold power + both vol until you see fastboot mode logo)
-use adb reboot bootloader from system if you cant boot manually

fastboot -w
fastboot update filename.zip

Done