Go through your steps to get wired connectivity again and update the firmware on your TV.
I copied the steps from LG:
- Press the Home/Smart Home button on your remote to bring up your launcher bar
- Click the Settings icon in the top-right
- Choose the All Settings option at the bottom
- Choose the General menu from the left
- Scroll down, near the bottom of the list, and select About this TV
- Ensure the Allow Automatic Updates is checked
- Click the Check for Updates button
- If an update is found, follow the steps on screen to download and install it
