Sony has released today's PS3 update 4.90, which is a minor download that does nothing to add any additional features. See more information about today's firmware system update in the PS3 patch notes from February 28.
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Note that, although Sony does not disclose it specifically, these firmware updates provide additional protection against potential exploits and the like.
We'll be sure to update the article if there are any additional or additional information that are identified by the community. Don't worry about it.
