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: The primary purpose of 4.91 is to renew AACS encryption keys for the Blu-ray player. Without this update, many newer Blu-ray movie discs may fail to play on the system.

The serves as a testament to Sony's hardware iteration strategy. By stripping away expensive components (like the "OtherOS" support and motorized drives) and shrinking the die size of the processor, Sony was able to lower the price point to mass-market levels. While often criticized by collectors for its "cheap" plastic feel and manual disc drive, it is mechanically one of the most reliable and energy-efficient PS3 models ever produced. ps3 491 top

Disclaimer: This is a high-level overview for educational purposes. Modifying your console may violate Sony’s Terms of Service and voids warranties. : The primary purpose of 4