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im not sure it will play movies from USB, never tried it but i did use a regular old USB to update to the latest firmware. The TV was not updating and when i contacted Samsung they said it needed to be updated via USB and that i needed an empty USB stick for it to recognize the update. Try Samsung website they have a chat support so you dont have to wait all day on the phone.
Sorry, there was a problem. Please try again later.First stick the USB stick into the back of the tv. It will automatically see the USB and with the remote just click enter. Or you can click on source until it selects it.
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