Start by upgrading firmware to 5.03, for this you need to download firmware 5.03 file
, then connect PSP with PC through USB. After this, start downloading the file by clicking on exe file. It would start copying the firmware date in your PSP. After copying gets complete then go to your game option, then Memory stick, Firmware 5.03 and after pressing X the upgrading of the firmware to the original firmware 5.03 begins. Then you could start hacking your PSP by downloading essential files.