Black PSP Phat 1.5-> 1.51 ->1.52 -> 2.0 -> 2.01 -> 2.5 -> 2.6 -> 1.5 -> 2.71 SE-A -> SE-B -> SE-C -> 3.10 OE-A -> fried motherboard

Black PSP Phat 2.6-> 1.5 -> 3.10 OE-A -> 3.71 M33-3 -> given to little brother

Star Wars White PSP Slim 3.6 -> 3.60 M33 -> 3.71 M33-3