I used to do firmware upgrades for LG years ago.
As a general response, its 6-7 years old, toss it in the bin!
You can buy a brand new Brand Name 40" 1080p Smart TV for $800
That makes your LG worth $50 tops
If you do some searching on here, there is the firmware and loader program somewhere.
You will need a Windows PC with a serial port and serial null cable.
The loader program and firmware to match your TV
You can get into the service menu by holding menu on the remote at the same time as holding menu on the TV
You need to change buad rate
You can also see what firmware is installed in this menu
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