Dell sent me another Deployment ISO with less than the full System Bundle of updates on it. Booting to it from the vFlash allowed it to update the firmware of the Lifecycle Controller, but nothing else, even after subsequent restarts. I then mounted my Windows-DUP-based SUU ISO from vFlash and was able to use the Platform Update feature of the LC to update the rest of the firmware without an issue.
My take is that the previous version of the Lifecycle Controller firmware had a problem with what I was trying to do, but once it was updated, the firmware update process worked fine. I've passed this info along to Dell and am waiting to hear their diagnosis.
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