I re-flashed the idrac and then the BIOS upgrade ran without issue.  Thank you!
"Unified Server Configurator Failure - Detach USC failure - Detaching a partition has failed"   I looked at lifecycle controller but nothing was able to select to cancel so it appears nothing was running.   was trying to update BIOS from 2.7.0 to 2.9.0.  I got same on going from 2.7.0 to 2.8.0   When trying to download EFI file it just brought me to a page with code not able to download file to update via idrac   any suggestions? 
BIOS Windows update error - Dell PE R720xd