I have little problem. I stuck with 05.05.01.
When I click "Check update" then TV start switching chanels in the background and after few minutes says can't find any update..
I did yesterday FW downgrade using Simon procedure http://www.lgwebos.com/topic/1997-how-to-downgrade-webos-tv-firmware-tutorial/
then Tv start dowloading new FW's (couple versions) but again stuck with 05.05.01, and again start switching chanels and no update found..
My tv 47LB731V-ZE
p.s Yes I can use USB stick, but I need to know what happen with my TV first .. Please note that in the past I used Beta versions as well..