Unlock Xiaomi Redmi 4X (santoni) and install Lineage OS via sideloading
So far the most useful documentation was at Lineage's Redmi section, random "mobile enthusiast" sites were "not very good" and youtube videos are to be avoided like the plague.
Files needed
- SDK platform tools from android.com
- mi flash unlock gui tool (
miflash_unlock-en-5.5.224.24.zip
) - newest twrp for device (
twrp-3.5.2_9-0-santoni.img
), from twrp site