Originally posted by MRBHCK:

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Hello is there a way to tell the Version on a Slim psp just by looking at the Box it came in:) Because i remember there was a way for the fat psps:) Now I know that {all the new Black psp are 4.01}

check the letter below 220-240v text at product information sticker located right side of the box(i forgot about the firmware version for each letter..and a lot of retailer update it to 4.01...so what i mean is,most of psp is 4.01