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this is mostly for slims as thay cant run 3.52 or lower firmwares but also works for fat psps,this is usefull cus sum psx game need a sertion firmware to work.

hold R wen starting a psx game this will bring up a screen that will let you pic a firmware to run a psx game on , i will say wat firmware a psx game runs best on wen i post it so enjoy guys/girls.