6.61 Infinity
6.61 Infinity (permanence)
6.61 Infinity is the piece that turns a temporary custom firmware into a permanent one. On its own, running a CFW installer like ARK-4 or 6.61 PRO only lasts until the next reboot. Infinity solves that by hooking into the system's boot process so the CFW reloads automatically every single time you power on.
How it works
Infinity patches part of the firmware that runs during startup. When the PSP boots, that patched component quietly re-applies the custom firmware before you ever reach the home menu. The result is a console that simply is running CFW from the moment it turns on, with no manual launching required.
Infinity is not the CFW itself
Think of Infinity as the permanence layer, not the custom firmware. You still choose ARK-4 or 6.61 PRO as your actual CFW. Infinity ensures that choice loads on every boot. The two work together: CFW installer for the features, Infinity to make them stick.
When to install it
Install Infinity as the final step, after you have updated to 6.61 and confirmed a CFW installer boots correctly. Doing it last means you have already verified your console is healthy and on the right firmware.
Reversibility
Infinity can be uninstalled, returning the PSP to a clean official-firmware boot. Because it only modifies recoverable parts of the system, it is considered a safe, low-risk way to achieve a permanent setup on the 6.61 firmware.