The PlayStation Portable (PSP), released by Sony in 2004, utilized a proprietary operating system based on a monolithic kernel architecture. Throughout its lifecycle, Sony and the homebrew community engaged in a continuous "cat-and-mouse" game regarding system security. Sony’s primary defense mechanism was the enforcement of digital signatures on executable binaries (PRX and ISO formats).
Run the installer from your PSP and follow the on-screen instructions to flash it. Set Permanence : After rebooting, run the Infinity app again. Press Left on the D-pad to see the list of installed CFWs. psp 6.61 cfw permanent