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The TV should automatically detect the update. Follow the on-screen instructions to begin.
This is the safest method as the TV validates the file before installation. Device Preferences System Software Update Check for a system software update firmware sony 43w800c
Since many official direct download pages are now retired, you should first try the built-in update method: Press HELP on your remote →right arrow System software update →right arrow Automatic software download →right arrow On . The TV should automatically detect the update
Before updating, identify which firmware your TV is running: firmware sony 43w800c