If your TV is working and connected to Wi-Fi, this is the easiest method. Open Settings : Use your remote to navigate to the gear icon. Go to Device Preferences Device Preferences Check for Updates System update and then choose Check for update Download and Install
Priya nodded. "That happens sometimes. If the software is too corrupted to connect to Wi-Fi, we have to do it the manual way. It sounds scary, but it's actually very simple."
: Before attempting a complex firmware download, try unplugging the TV for 5 minutes to clear temporary glitches. Manual USB Update