From the users manual:
To obtain the latest software for this player (if updates have been made), please contact the following:
Call 1 (800) 243-0000 or
and click on PRODUCT SUPPORT → Device Driver.
From the upgrade instructions:
1. You have to make a upgrade disc of DVD UDF format using fixed a file name.
(file name: LG_BH_LX100001BN.ROM and update00.bin, volume name of Disc: anything is OK)
(If you use the iso file, you just use the image copy and copy the image file that is called the iso
file to DVD disc)
2. Insert the upgrade disk into the SET and press Play key according to OSD guide.
3. Wait until power off in itself.