[UNOFFICIAL BUILDS] Sony Xperia Tablet Z LTE/Wifi (pollux / pollux_windy) for /e/OS-Q

Did you follow all instructions from here:
https://xdaforums.com/t/rom-development-9-0-lineageos-16-0-pollux-pollux_windy-unofficial.3924942/

You might also try even A13 based version: