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PSP Firmware 6.60 Released » Brewology - PS3 PSP WII XBOX - Homebrew News, Saved Games, Downloads, and More!
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4 Ways to Upgrade Your PSP Firmware - wikiHow
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PSP Custom Firmware 6.00-6.61
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Release: Infinity 2.0 – Enables Permanent 6.6x Custom Firmware for all PSPs! - Wololo.net
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