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PlayStation 3: Sony releases Firmware 4.87 for their 14 year old console - HFW 4.87.1 is already out with SEN Enabler already being updated to spoof FW 4.87 - Wololo.net
PS3 Update to System Software 4.89: Here's a Full Guide for You - MiniTool Partition Wizard
The PS3™ Guides: Updating Your PS3 - YouTube
PS3 System Software Update (v3.70) – PlayStation.Blog
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PS3 System Software Update 4.90: What's New and How to Update | TheBadGamer