Downgrade nexus 7

I have a nexus 7 (2013) that was bought in 2015. It shipped with 5.0.2 Lollipop. I need to downgrade to Kitkat, and I know what you'll say, either to use nexus root toolkit, or to flash the factory image. Both get me stuck on the google splash screen, does anyone know how to downgrade it? Thanks

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