PSP Slim&Light (200X) 2nd PSP generation · Pandora Battery access: Yes · Downgrading possible: Yes · lowest Firmware: 3.60 · Permanent CFW available: Yes

Result: You can install a newer full Custom Firmware of your choice!

Note: You might want to consider staying on a 6.60 CFW since most plugins,
themes and programms are not optimized for 6.61 as of yet!