The update downloads but fails to install. The fix: Your hard drive might be too full. The PS4 needs roughly 1GB of free space to unpack the update. Delete old game captures or unused apps.
Released in late 2021, System Software Update 9.00 was a mandatory stability and feature patch. Unlike minor updates that simply tweak the backend, version 9.00 introduced visible changes to the user interface (UI), messaging systems, and party functionality.
On September 15, 2021, the update rolled out globally. The official patch notes were characteristically sparse:
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