Hello friends, i think i found a way to downgrade 2017-2020 models tv (now its not possible by using current methods). The process is carried out through a computer using an RC232 cable. Can we overcome the obstacle to revert to old software using this method? Do you think this is possible? The link I provided is in Turkish, but you can translate it into English.
https://www.muratsever.com/lg-tv-yanlis-firmware-cozumu/