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PS3 will not see PUP file on usb when installing OEM firmware only (details below) : r/PS3
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How to Update a PlayStation 3 - Support.com TechSolutions
PlayStation 3 System Software Update (Version 2.0) (Europe) : Free Download, Borrow, and Streaming : Internet Archive
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Sony PlayStation 3 Firmware 4.88 Download | TechSpot
How to get PS3 Firmware update 4.89 for installing, Google and Edge covered in the video - YouTube