For those who may be new to PSP customization, M33 6.60 Portable is a popular firmware that is based on the original 6.60 firmware released by Sony. However, M33 6.60 Portable comes with a host of modifications and additions that make it a favorite among PSP enthusiasts. These modifications include:

Here’s a clear, professional, and user-friendly write-up for upgrading a PSP from custom firmware 3.52 M33 to 6.60 PRO-C (or ME/LME), which is the intended meaning of “660 portable.”

Now that your is complete, enjoy these benefits: