Need Help Disabling OTA & Amazon Launcher on HD 10 7th Gen

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I own a Fire HD 10 7th Gen and Amazon released an auto-update giving me the Fire OS 5.6.4.0 and taking away the option to make Nova Launcher my default launcher. I need help to disable OTA & the Amazon Launcher. Thanks!

 

[Dannydet]

You would have to root the device.
https://forum.xda-developers.com/?query=Amazon rooting