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The PlayStation 3 system software is the updatable firmware and operating system of the PlayStation 3. The base operating system used by Sony for the PlayStation 3 is a fork of both FreeBSD and NetBSD known internally as CellOS or GameOS .
A custom firmware known as "Rebug", [18] released on March 31, 2011, gave retail PS3s most of the options and functionality of debug/developer PS3 units. One week later, tutorials became available allowing users to download PSN content for free, using fake (rather than stolen) credit card numbers. [19]