I can provide a tailored list of the for your specific model.

Disconnect the USB and go to the menu on your PSP. Select the PRO Update icon and press X .

Now that you've downloaded the PSP 6.61 update, it's time to install it on your device. You can update your PSP using one of two methods: via the PSP's built-in Wi-Fi connection or through a computer using a USB cable.

Once on official 6.61, you can install the PRO custom firmware files. How To Update Your PSP TO 6.61 Official Firmware