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FYI- if anyone has upgraded to 7.0.1, you instead have to click the 3 dots next to edit icon on that page to access troubleshooting. This too me way too long to find.
What if you keep the same IP for the restored FMC? I ask because making the managed devices "unmanaged" will take down site-to-site VPNs, would it not? Making turning them back on remotely impossible.