On the back of the PSP box by the barcodes, there will be either an ‘A’, ‘B’, or nothing at all located below “120V”. If you do not have a letter that means it was purchased sometime near the US release (meaning 1.50). Having the letter ‘A’ means that the firmware is a 1.50, and seeing a letter ‘B’ there means 1.51. Now you won’t have to open the
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