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by ThatPlayer 2131 days ago
You can do it on the Uno, if it's real (or close enough) Uno that uses an atmega16u2 for the USB connection. Using HoodLoader2 like that post mentions: https://github.com/NicoHood/HoodLoader2 .

Most Uno clones skip the atmega16u2 and use a cheap USB to serial adapter instead, which will not let you reprogram it as a USB HID