FTVDB

Echo Flex (2019)

Model AEOCR. Fire OS 6.5.7.3 (NS6573/6554), build 12853025412, recorded May 12, 2026.

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Firmware package identifier com.amazon.croissant.android.os. This page preserves the metadata associated with one public firmware source record.

Version Name Fire OS 6.5.7.3 (NS6573/6554)
Version Code 12853025412
Uploaded 2026-05-12
MD5 eb393420c690fe8ee779b8e7c77b8b86

Original public source URL

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https://d1s31zyz7dcc2d.cloudfront.net/2026/5/12/579ac3da-c9f9-4a87-8aac-143f8dcd579d/update-kindle-croissant-NS6573_user_6554_0012853025412.bin Open source URL