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Upgrading standalone 448D, and not losing the entire config.

I'm looking to upgrade a few FortiSwitch 448D that are running on 3.6.4. I've uploaded 6.2.5 to the secondary image slot and clicked upgrade. Switch boots up with defaults...[&o]


I've dug around and come up empty on the procedure to upgrade a switch and retain it's config. Any advice?


Oh and reverting back to primary image boots 3.6.4 w/ config in place at least.

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