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After firmware 5.16.3, Kindles started using hard-float architecture (on-chip floating-point processor), while the earlier versions used soft-float architecture.
While the underlying system appears mostly the same, many internal software changes have made many programs, including jailbreaking tools and extensions, unusable in modern firmware versions.
Unless explicitly stated, most, if not all, extensions are not compatible.
You may considering to downgrading to 5.16.3 or older.
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