on a poweredge r510, i was trying to use the latest DUP to upgrade the idrac firmware and received “failed to access virtual usb device” followed up by the update failing to apply. i saw some forum posts saying that having an older version of OMSA installed could cause this. i installed the latest OMSA and it didn’t not resolve this error.

to get past this i ended up going to the virtual media settings in the idrac and setting the status to “detach” instead of “attach”.

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