When attempting to run a Dell firmware update you receive the error “Creation of Dynamic Partition Failed.”
In order to resolve the error reset the Dell iDRAC from the command prompt. Open a command prompt as administrator and run racadm racreset.
Once the iDRAC has reset retry the update.
Richard Skinner 
Perfect! Thanks so much. Helped me get past a stubborn BIOS upgrade that was not working.
Perfect! This helped me through a stubborn BIOS upgrade. Thanks so much.