How to install PSP firmware v2.00(JPN):
- Download the PSP Firmware v2.00(JPN) on to your computer.
- Put the EBOOT.PBP file you downloaded on to your PSP in the PSP/GAMES/UPDATE/ directory using a USB cable hooked into your PSP.
- Go into the memory card browser portion on your PSP, and select the update
- The install will be partially in Japanese
- When you finish installing, your PSP should be in English, if not, change the Language settings.