@maciej.ldc, I am bringing this issue to the attention of the Fin team for expert advice. Meanwhile:
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I’ve found this other forum thread that also reports a 32MB storage space following power failure.
Damaged Fin after power supply failure
In that thread it seems that the outcome was for the Fin to be returned for investigation and repair, but let’s first see whether the team has any different advice. Are you able to try a different power supply, just to rule out the possibility that the power cut affected the power supply? -
It also occurs to me to ask what you observe in the LED status panel. The following guide says that if the Fin successfully switches to USB Mass Storage Mode, then there should be “two red (5V and 3V3) and one green (ACT) LEDs illuminated on the LED STATUS panel”.