u/Content-Control9666

For some reason my Hisense U88H started to impose Dolby Vision on the SDR content (i.e. regular cable TV), thereby making everything darker including the skin tone. I have tried using Dolby Vision Custom to adjust the settings, while it is getting better it is not the same as the standard "Picture" settings (i.e. Vivid, Standard, Theatre Day, Theatre Night, Film Maker, etc.) I am unable to shut off the Dolby Vision or change it to the standard Picture settings. I have tried updating the software but it was unable for me to unzip or install on my tv. Any suggestions? TIA