Restoring Stock Recovery

I am trying to restore my Fire 8 (Karnak, 8th Generation) so stock. I currently have Fire OS 6.3.1.5 installed, with TWRP as the recovery. I am wanting to update FireOS to the latest version, but when I try this I get an infinite boot loop.

I suspect the problem is with TWRP being the recovery rather than the Amazon version. I found some instructions here, but when I try that I...

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