[USGFLEX50] Upgrade Firmware failed

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Good morning,
I have to update the firmware of a USGFlex50 from version 5.30 ABAQ.0 to 5.36 ABAQ.2, but every attempt is unsuccessful.
I've tried updating via cloud, via ftp, manually.
I have no error, simply the firewall does not complete the procedure. Even restarting the firewall I always have version 5.30 ABAQ.0.
How can I fix? Thank you
Matteo

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