In recent updates to the Fire TV, Fire TV Stick, Fire TV Stick Lite, Fire TV Stick 4K, Fire TV Stick 4K Max, Fire TV Cube, and Fire TV Smart TV, has hidden/removed the Developer Options menu where you can enable ADB debudding and enable installing apps from unknown sources, such as Downloader
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blocks long-running Fire TV capability — Breaking popular apps with no warning and giving developers the runaround
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Log – Minecraft Wiki