55LM5800, 55LM5850 (CHASSIS:LA21B) - LG TV Service Manual (repair manual). Page 14

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9. USB S/W Download 
    (optional, Service only)
(1) Put the USB Stick to the USB socket 
(2) Automatically detecting update file in USB Stick
  -  If  your  downloaded  program  version  in  USB  Stick  is  lower 
than  that  of TV  set,  it  didn’t  work.  Otherwise  USB  data  is 
automatically detected.
(3) Show the message “Copying files from memory”
(5) Updating Completed, The TV will restart automatically
(6)  If  your TV  is  turned  on,  check  your  updated  version  and 
Tool option. 
*  If downloading version is more high than your TV have, TV 
can lost all channel data. In this case, you have to channel 
recover. If all channel data is cleared, you didn’t have a DTV/
ATV test on production line.
* After downloading, TOOL OPTION setting is needed again.
(1) Push "IN-START" key in service remote controller.
(2) Select "Tool Option 1" and Push “OK” button.
(3) Punch in the number. (Each model has their number.)
(4) Updating is staring.
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