Direct download to the PSP over Wi-Fi. This can be performed by choosing [Settings], [System Update] from the XMB.
Download to a PC, then transfer to the PSP via a USB cable or Memory Stick.
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 and American version only)
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 6 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. The battery must be at least 50% charged or else the system will prevent the update from installing. If the power supply is lost while writing to the system software, the console will no longer be able to operate unless the system is booted in service mode or sent to Sony for repair if still under warranty.
The current version of the software, 6.61, was made available on January 15, 2015.
First "universal" firmware version for the original PSP-1000, PSP-2000 PSP Slim & Lite and PSP-3000 series
[PlayStation Network] has been added as a category on the XMB
[PlayStation Store] has been added under [PlayStation Network] menu
[Account Management] has been added under [PlayStation Network] menu
Sleep Timer Function for [Music]
[USB Auto-Connect] Feature added for PSP-1000 and PSP-2000 under [System Settings]
A new full-screen keyboard; press [Select] when the On-Screen Keyboard is displayed.
A new redesigned XMB Background [Original] added as an option under [Theme Settings]
A new video format is supported (MPEG-4 AVC (H.264) Video Main Profile (AVC CABAC) in 640 × 480 pixels)
[Title Display] feature added under [Video Settings]
Screen capture has been added as a feature within games and the internet browser (this is up to the game developer or the web site developer to support though).
PlayStation format software can now be output in full-screen size on a connected device, even if it doesn't have progressive input capability. Still PSP format software can only be output on devices that have progressive input capability.
Pre-installed Only First found on December 5, 2008
Only available pre-installed on the initial release of the black Rachet & Clank Entertainment Pack PSP-3000 series in North America and possibly some later production units of the Silver Rachet & Clank and Gran Turismo bundles in North America and other colors and regions worldwide.
An overclock bug (or limit?) was introduced with this update preventing the CPU from going above 222mHz while WiFi is activated. This is a predictable and reproductive behavior where if the CPU is overclocked (such as 266-333) before activating wifi, the behavior is nullified until the next complete shutdown. This is still present in the latest firmware. This could have been an attempted limit by Sony to anticipate the lower voltage of the battery in the PSP-2000 to prevent drawing too much power at once.
October 13, 2005
[Set via Internet] has been added to [Date and Time] in [Date & Time Settings].
[WPA-PSK (AES)] has been added as a security method under [Network Settings].
Copyright-protected video can now be played.
LocationFree Player added.
[Auto-Select] and [Unicode (UTF-8)] added to the browser.
Settings for [Text Size] and [Display Mode] and the input history of online forms accessed can now saved in the browser.
Korean input mode has been added to the on-screen keyboard.
October 3, 2005
Revisions to strengthen security have been added.
Security update to patch the original (first of 3) TIFF exploit.
September 1, 2005
Initial UK release (with included update disc)
Korean has been added as a system language in [System Settings].
[Character Set] has been added in [System Settings].
[Theme Settings] has been added.
[Internet Browser Start Control] has been added as a security mode in [Security Settings].
WPA-PSK (TKIP) has been added as a security mode in [Network Settings].
Web address shortcut feature has been added as an input mode for the on-screen keyboard.
4:3 Screen Mode has been added (for video saved on Memory Stick Duo media).
Go To feature has been added (for UMDVIDEO and UMDMUSIC).
A-B Repeat feature has been added (for UMDVIDEO, UMDMUSIC and video saved on Memory Stick Duo media).
Audio options have been added (for video saved on Memory Stick Duo media).
MP4 (AVC) has been added as a playable file format (for video saved on Memory Stick Duo media).
The combination of SonicStage version 3.2 (or later) and PSP system software 2.00 (or later) has made it possible for music files in ATRAC3 plus format to be transferred to a Memory Stick PRO Duo
MP4 (the audio codec for MP4 format audio files is MPEG-4 AAC) and WAV (Linear PCM) have been added as playable file formats (for music saved on Memory Stick Duo media).
Wallpaper feature has been added.
Image transfer feature has been added.
TIFF, GIF, PNG and BMP have been added as viewable file formats.