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Hello there. We appreciate you reaching out to us. We understand your inquiry about the OLED77C4PUA TV. For the best performance, especially when using features like 4K at 120Hz, we recommend using a certified Ultra High Speed HDMI 2.1 cable. These cables are designed to handle the high bandwidth required for the advanced features of your TV. If you need any further assistance, please send us a private message on Social Media @LGUSSupport and our team will be more than happy to explore possible solutions. https://www.bestbuy.com/site/lg-77-class-c4-series-oled-evo-4k-uhd-smart-webos-tv-2024/6578044.p?skuId=6578044 We appreciate your patience. —Renzo
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