The system software update data has been corrupted.
Solution:
If you are attempting to perform a system software update via a game disc, ensure that the disc is clean and free from dirt, marks or scratches.
If you are attempting to perform a system software update via an external storage device, download the system software update data again. If the problem persists, attempt to perform the operation using a different external storage device.
If you are attempting to perform a system software update via the Internet, attempt to perform the operation again.
If the problem persists, restart the PS3 system and attempt to perform the system software update again.