Upgrading Sony Xperia Z Tablet (SGP311) to Android 7.1
Using the Lineage OS Install guide I had no problems installing it, but make sure you have enough battery. I started out at 10% the first time and this was not enough. Make sure it is at a minimum of 50%
LineageOS Download for SGP311 - https://download.lineageos.org/pollux_windy
LineageOS Install Guide for SGP311 - https://wiki.lineageos.org/devices/pollux_windy/install