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Don't know why you would want to do that since A05 is a very stable ROM update. Anyway, you would have backup the A04 ROM image when you updated it to A05. Restore that image and you are back to A04.
If you did not backup, go to Dell's website and find the A04 ROM update file. You can find it in the FTP page of the Drivers and Downloads section in Tech support.
All the best.
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