PlayStation Portable System Software is the official, updateable firmware for the PlayStation Portable. Updates add new functionality as well as security patches to prevent homebrew games and applications being run on the system. Updates can be obtained in four ways:
Direct download to the PSP over Wi-Fi. This can be performed by choosing “Settings", “Network Update" (“System Update" in later versions) from the XMB. (This will always download the latest version)
Included on the UMD of some games. These games may not run with earlier firmware than the version on their UMD.
Download from a PS3 to a PSP system via USB cable. (Japanese version only) (This will always download the latest version)
While system software updates can be used with consoles from any region, Sony recommends only downloading system software updates released for the region corresponding to the system's place of purchase. System software updates have added various features including a web browser, Adobe Flash Player support, additional codecs for images, audio, and video, PlayStation 3 connectivity, as well as patches against several security exploits, vulnerabilities, and execution of homebrew programs. If the power supply (Battery/AC) is disconnected while updating the system software, the console will be bricked. The system will have to be booted from a different source such as a battery in service mode with which it can be restored.
The current firmware version is 6.61. It was released on January 15, 2015.