After updating the PS3 Firmware, Sony has also decided to update the PSP Firmware bringing it to version 3.52. The firmware update for the PSP isn’t as feature-rich as the PS3 one, bringing only better PSOne compatibility and possibly an increase in security.
The regional websites have not been updated with the download yet, so you will only be able to download the update via the Network Update feature for the time being. We will bring you a complete changelog once the regional websites have been updated.