Not unless you want to try all of these steps in setting up your PC as a proxy server....
http://www.ps3blog.co.za/2009/05/18/...s-via-your-pc/
Otherwise, it's not as cut and dry as the system updates unfortunately.
Another option is to get PS+ it donwloads and installs the patches automatically for you once a day at a time you set (i.e. mine is 10am to sync trophies, download patches, upload saves to the cloud, etc.)
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