LG NP5550W - IMPORTANT SAFETY INSTRUCTIONS; Battery Removal and Recycling

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Hidden Key Description
Dual Play Master “Bluetooth” + “Volume Up” key for 2 seconds
Dual Play Slave “Bluetooth” + “Volume Down” key for 2 seconds
Hardware PMC Mode Entry Push long time the "Power" key
TV Mode Entry “Bluetooth” + “Play/ Pause” key for 2 seconds
Scan Enable “Bluetooth” key for 2 seconds
Bluetooth All Disconnect/ Paired List All Clear “Bluetooth” key for 10 seconds
Demo Entry “Bluetooth” + “Power” key for 7 seconds
APD OFF, Vibe Test Volume, FOTA Administrator Mode “Volume Up” + “Power” key for 2 seconds
Forward Skip Pressing the “Play/ Pause” key twice
Back Skip Pressing the “Play/ Pause” key thrice
Hardware Measurement Mode Entry
“Bluetooth”  “Volume Down”  “Play/ Pause” 
(“Bluetooth” + “Volume Down” + “Play/ Pause”) key
Factory Reset (All LED Blink) “Power” + “Play/ Pause” key for 2 seconds
HIDDEN KEY MODE