The JEFF.BIN is located in JOURNAL folder, in the SD, and appears after every attempt of recovery.

<SD label GARMIN>\JOURNAL\JEFF.BIN

Has 32,768 byte lenght (or 2^15, if you prefer).

Is an hidden file, dated 01/01/1601 and all the byte are set to 0 (zero).

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Maybe it is what remains of the mechanism of jourmaling after the attempt (and the failure) of the restoration ???