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You can unlock the Amazon Fire TV Stick 4K bootloader (but it's not easy) - Liliputing
The Amazon Fire TV Stick 4K is a $50 media streamer that comes with an Alexa-enabled voice remote, support for 4K HDR playback, and the ability to stream videos and music from most popular sources (including the recently re-added YouTube). But that’s not good enough for some folks — so xda-developers member k4y0z has posted …