Samsung UN40D5550RF - TV Control Panel and Operation; Control Panel Button Functions; Standby Mode Recommendations

 Cautions
While upgrading,
 Do not pull the USB Memory drive out.
 Do not unplug the power cable.
 Do not turn off the TV with remote control.
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Warning
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Warning
Pulling the USB Memory drive out or unplugging the power cable will cause
firmware error or main board failure. Those cases are not covered by Samsung
warranty policy.