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 eu.playstation.com/get-help/ps4-system-software/.
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.