From personal experience, I know that Amazon actively tweaks the os of their fire sticks to disallow doing this. I found that while I was able to reconfigure the device, within a short while, some of the sideloaded apps would stop working or disappear entirely. The only way that I found to get around it was to block the Amazon update servers on the router level, and even then, that tactic failed. I ended up switching to Roku.
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