hknerdr

Hi, I have 55UB950V and i installed 5.10.30 beta release a few years ago. Now i researched and saw that 5.05.90 version is out at LG website. Is this a newer version? Is it webOS 2.0? I think i can't install it because the beta version number is higher than the official version. So how can i downgrade the version of my TV? Also is it possible to install webOS 3? Thanks