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Echo Flex (2019)

Model AEOCR. Fire OS 6.5.7.3 (NS6573/7575), build 12920395652, recorded Jun 6, 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 (NS6573/7575)
Version Code 12920395652
Uploaded 2026-06-06
MD5 fa02fa98474a9ace5aa866dfaf672ff4

Original public source URL

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https://d1s31zyz7dcc2d.cloudfront.net/2026/6/6/4e037860-c945-4507-bcb1-1d9c33d4e489/update-kindle-croissant-NS6573_user_7575_0012920395652.bin Open source URL