(adsbygoogle = window.adsbygoogle || []).push({}); ive jailbroken many ps3 but never heard of a 20018 model it is a 320gb . i thought there were only 2001b and 2001a?

The easiest way to check is the date code on the bottom of PS3

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Then look at this chart to see if your PS3 can be downgraded

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thanks