Updating psp with usb
Sony offers three different ways to update your PSP's firmware, so you can choose the one that works best for your internet connection and equipment.
Because there are three different ways to update, the first step is to choose which one you'll use.
Read the instructions for each if you're not sure, and choose the one that fits best for you.
Fortunately, updating your PSP's firmware is not difficult, though it can be a little confusing at first.
Keep in mind, however, that if your want to run homebrew programming, updating your firmware might not be the best choice.
If you just want to run official software and games, though, updating is the best choice.
Then navigate to the PSP's game menu on the XMB menu and select update.
Make sure the PSP has about 50% battery and is connected to a power source, just to be on the safe side.