you need to be really careful with firmware updates they can destroy your device if not careful, if the tv thinks it's the wrong firmware it wont let it in, if the usb stick is formatted wrong it wont work ? some firmware needs to be "unpacked" before installing was there any install notes with the firmware? did the firmware come from lg Australia or could it have been lg us or similar ?
check you used the right LG site, double check you have the correct firmware for your set, make sure the stick is formatted to fat or fat32 or whatever lg say to use. That's just a few things I can think of that might get in your way.
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