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downgrading your psp is something you might want to think about thoroughly before giving it a try because it has so many implications like permanently damaging your psp(bricking your psp). if you feel like you still want to go ahead, there are a few websites like psphacks.com that would provide you with enough information on if your psp is downgrade-able or not.if you feel you still haven't gotten enough information on it from this website, feel free to contact me and i'll help you with additional information. hope this was helpful to you? please rate
Download MPH Downgrader and Firmware version you want(e.g 1.50) to the Windows-based computer. Connect the PSP Slim to the computer's USB port using the USB connector. Transfer the two programs to the main folder of the PSP Slim. Disconnect the PSP Slim from the computer's USB hub when the transfer is complete.
Turn on the PSP Slim. Go to the Settings/USB Connection in the Home menu and select the EBOOT.PBP file in the PSP\GAME\UPDATE update folder. Extract the MPH Downgrader zip file to the root folder of the PSP. Click OK using the X button if you are prompted that this will replace some files.
Go to Photo/Memory Stick in the Home menu. Wait as the screen goes black and numbers appear. Wait two minutes and then press and hold the power switch until the PSP Slim turns off. Release the power switch.
Wait as the PSP Slim turns on and reboots. Go to Game/Memory Stick in the Home menu and select PSPS Update version 1.50. Press the X button to start the update.
Wait as the update finishes and presents an error message. Press the O button to restart the PSP.
i have tried this also i dont think there is a pass for this i have tried every folder every combination and everytime it is corrupt the only way to get onto system is to downoad from ps store it has some good demos you can try also walmart it running specials on psp games some 5-10$ hope this helps you
do you mean by off the internet? one thing about downloading off the net is you can brick your psp which means you get a virus on it and it wount work anymore so if you do make sure you do not update your psp from the day you put the games on it. you can get games from limewire, or just google free psp games