Maybe it won't work, but modify the appinfo.json of copilot app and change from "removable":false, to "removable":true,, and going to home and uninstall it.
Before uninstalling, it requires reboot to take effect and deleting copilot. Might say something like Permission denied or it changes from true to false. Needs root access though.
You can go to Homebrew Channel, and into the settings, and enable Block system updates, and reboot. This only works if your TV is rooted.
If it's still displaying the software update alert, then
block the LG update domains in your router or add them to the blacklist here:
snu.lge.com su.lge.com su-ssl.lge.com snu-dev.lge.com su-dev.lge.com nsu.lge.com
Try to open any HDMI input, and press and hold the gear icon until quick settings UI disappears and HDMI banner appears on corner, and quickly press 1105, and press OK button. Then enable Hotel Mode, and go to Limited Mode, and going to OSD Display.