It's not the WinterBreak method. It is that with firmware 5.16.3 or newer, Amazon switched to using hardware floating-point replacing the older software floating-point. That is why you will see hf added to the name of files for newer firmware. i.e. KOReader will use kindlehf (koreader-kindlehf-v2024.11-270-ga3d4e9754_2025-03-19.zip for instance).
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