PSP Firmware 3.10

• Support for PLAYSTATION Network titles has been expanded.
• Support for the MPEG-4 AVC format has been added under [Location Free Player]
• [Dynamic Normalizer] has been added as a feature under [Sound Settings] in [Settings].

Also included is a memory saving mode for the internet browser (In the internet browser, go to Tools -> Settings). Word is, though, if you have custom firmware the upgrade may brick your system.

Download it here.