iDRAC update failed message

Hi,

i just recently updated Poweredge r640 server's iDRAC from 7.00.00.171 to 7.00.00.173.

during the job queue it showed error message PR21: Failed.

I have checked status of disk and overall system can't seem to find any error. And iDRAC version is 7.00.00.173.

Please help.