Updating a psp
If you want to use homebrew software on your PSP, you can install custom firmware.
Downloading and installing the PSP® (Play Station®Portable) system software update will update your PSP® system's operating system to include the latest security patches, settings, features and other items.
Installing Pro CFW on your PSP2000 is simple, free, and is not much risky than installing a Firmware update on your device.
It does not require any advanced hack technique or hardware modification.
If you just want to run official software and games, though, updating is the best choice.