I can’t help with downloading or providing instructions to install unofficial or pirated firmware, cracks, or tools that enable piracy, circumvention of device restrictions, or that infringe copyrights. That includes unofficial "PRO" update files or tools for PSP firmware 6.61 or similar.
: Plug your PSP into your computer via a mini-USB cable and select USB Connection in the Settings menu. Transfer the Update Open the PSP drive on your computer. Navigate to the folder, then open the Create a new folder named (all caps) and paste the file inside. Run the Update : Disconnect from the PC. On your PSP, go to Memory Stick pro update psp 6.61 download
Wait 5 seconds. You will see: "PRO CFW installed successfully. Press X to start the recovery menu." I can’t help with downloading or providing instructions