Install MindTheGapps-15.0.0-arm64-ATV-xxxxxxxx_xxxxxx.zip from your selected storage
Wipe -> Factory reset!
Boot out of recovery (see FAQ)
Q: How to boot to TWRP recovery? A: You can boot to TWRP by selecting Settings -> System -> Power and Energy -> Restart -> Recovery after enabling advanced restart options.
If mouse cursor doesn’t appear, try replugging your mouse.
Q: How to enable advanced reboot options? A: Settings -> System -> Buttons -> Advanced restart
Q: How to enable developer options? A: Settings -> System -> About -> Click ‘Build number’ several times.