Psp 6.61 Infinity 2.0 Cfw Pack By Mrmario2011 »

When completed, the system will prompt you to reboot. Press to restart the PSP. Step 3: Installing the Custom Firmware (PRO or LME)

Disconnect the USB and go to the menu on your PSP. Launch the PRO Update (or LME Installer). Press X to install the firmware.