LG 42PC3RA Service Manual page 15

(3) Push the S/W off (Disconnect SCL to GND using switch at jig.
(4) `Execute 'Download.vi2c' program in PC, then a main widow
will be opened.
(5) Double click the blue box and confirm "Bootloader Version"
as 40.
(6) Click the "Erase Flash" button.
(7) Double click the download file low then, "edit" window will be
opened.
(8) Chick the choice button I n the "edit window", then "file choice
window' will be opened.
(9) Choose the Hex file in folder and execute downloading with
click "open button".
(10) Click OK button at the "edit window".