[UNOFFICIAL BUILDS] Sony Xperia Z4 Tablet (karin / karin-windy) for /e/OS-R

Have you tried to reboot system from there despite the message ?

Have you tried another factory reset at this point ?

https://xdaforums.com/t/rom-11-lineageos-18-18-1-z4tablet-sgp712-771.4199169/