Using a USB cable, connect your PSP to your computer and enable "USB Connection" mode. Download the 6.61 PRO-C2 ZIP file, extract it, and copy the PROUPDATE and FastRecovery folders to your PSP's memory card at the following path: ms0:/PSP/GAME/ (If the GAME folder doesn't exist, you can create it).
Below is a comprehensive guide on how to safely download and install the 6.61 PRO-C2 custom firmware to unlock your handheld's full potential. Why Choose 6.61 PRO-C2? download the psp 6.61 pro-c2 custom firmware