55S425 Accidentally enabled Local Dimming in secret menu.
Hey guys, I'm new to this site and hoping somebody out there can help me with a horrible problem I am experiencing. So to begin I bought the TV last week and was extremely disappointed with the Dolby Vision performance on Netflix. I searched google for a little until I encountered someone saying something about a secret menu and local dimming.
I entered the secret menu by pressing Home 5x, <<, pause, >>, pause, <<. There was an option in there to install local dimming firmware. I was stupefied after installing when I saw bright horizontal lines going across the screen only in the upper 80%. I'm assuming that local dimming software was not made for this model TV. OK, so I went back into the secret menu and set local dimming to off but the lines still appear when viewing content. Now I begun to look for a way to uninstall the software but it wasn't in the menu.
I tried doing a factory reset to no avail. I even loaded a stock firmware update from Roku's usb update site but the TV says the firmware is not a valid file. I'm thinking that the actual firmware number got changed to that of another TV thus not allowing me to install an update file from the actual model.
My options now are to hopefully find someone out there who can help me with this problem, or return the TV where I bought it since I've only had it for a week.