Just throwing in my two cents on my experience. My kindle wasn't busted, but I couldn't upgrade it to the new 5.1.2 (apparently the custom upgrade screens I had made pissed Amazon's upgrade deal off, go figure?). Since the gitbrew site is down, I followed the instructions but used the 5.1.2 image and kernel instead of downgrading back to 5.0.0. Worked like a charm!
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