This update file cannot be used

The update file on your USB device cannot be used.  To install an update file from USB, please make sure that you're using the correct update type:

For a standard update you'll need the latest version of the System Software which can be downloaded from http://eu.playstation.com/systemsoftwareversion/.

If you've tried using this file already, or if you've installed a new Hard Disk Drive or initialised your system, you'll need to carry out a new installation of the System Software. You'll find instructions on how to install this, as well as the download file here.