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This specific file refers to or a software dump for a smart TV mainboard. Specifically, SK506S.PB802 is a popular Android 9.0 universal motherboard used in many 75-inch and smaller Chinese-manufactured smart TVs, such as those from Nordmende , Erisson, and Telefunken.
Below is a draft post you can use to share or request this file in technical forums or social media groups.
TP.SK506S.PB802 Network WiFi TV motherboard ... - AliExpress