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To manually change the resolution on your Insignia™ 50” Class F50 Series 4K UHD Smart Fire TV, especially when it's connected to a device like the Xbox Series X and displaying at 720p, you can use a built-in remote shortcut. Simply press and hold the top part of the navigation ring (the "Up" button) and the Fast Forward button on your Fire TV remote at the same time. Hold both buttons together for about 10 seconds. The TV will begin cycling through the available resolution settings such as 720p, 1080p, and 4K. Patricia | Insignia Support
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