Fixes: Settings: The [Install Other OS] and [Default System] features have been deleted. If you update your system software to version 3.21 or later, you will not be able to use [Install Other OS] or [Default System] under (Settings) > (System Settings). Other: The playback quality of some PlayStation format software that is downloaded (as a purchase or for free) from PlayStationStore has been improved. A security patch was added to address security vulnerabilities that may occur when playing MP4 format video files.
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