CFW(Custom firmware) is the go, provided your slim is back-ward compatible(all FAT's & 2K Slim are ok), some 2K5 can be done, anything after that is no go & you have to go with a physical modchip like Cobra/3k3y. All these mods allow to play from USB, with CFW also allowing you to play from int hdd. PSx/ps2 via burnt discs can also be achieved with CFW.
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