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To update your Insignia 42" Class F20 Series LED Full HD Smart Fire TV to FireOS 7.6.6.8, you typically wouldn't need to download firmware directly from a website. Instead, firmware updates for Fire TV devices are usually delivered over-the-air. Here's how you can check for updates. Make sure your television is connected to the internet. Go to "Home" > "Settings" > "Device" > "About" > "Software Version" > "Check for updates". Patricia | Insignia Support https://www.bestbuy.com/site/insignia-42-class-f20-series-led-full-hd-smart-fire-tv/6495088.p?skuId=6495088
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