... I don't know if this new beta firmware fixes the 60HZ Dolby Vision issue (I don't think so)... but maybe you want to try 
http://su.lge.com/GlobalSWDownloadC....k2l-4305-05.30.10-prodkey_nsu_V3_SECURED.epk
Again this is a Beta Firmware. You install it on your own risk.
Source: http://www.hifi-forum.de/viewthread-312-550.html
http://su.lge.com/GlobalSWDownloadC....k2l-4305-05.30.10-prodkey_nsu_V3_SECURED.epk
Again this is a Beta Firmware. You install it on your own risk.
Source: http://www.hifi-forum.de/viewthread-312-550.html