Firmware 1.00
Released: December 12th, 2004
Video: MP4
Audio: MP3
Photo: JPEG
RSS Audio: No
RSS Video: No
Web Browser: Unofficially. Wipeout Pure Hack
Homebrew: No
Downgrader: N/A
New Features: N/A
Firmware 1.50
Released: March 24th, 2005
Video: MP4
Audio: MP3
Photo: JPEG
RSS Audio: No
RSS Video: No
Web Browser: Unofficially. Wipeout Pure Hack
Homebrew: Yes
Downgrader: Yes
New Features:
* Additional languages added to Settings:
German, Spanish, French, Italian, Dutch, Portuguese and Russian
* Video can be resumed after the PSP has been put into sleep mode
* Music can be resumed after the PSP has been put into sleep mode.
Firmware 1.51 and 1.52
Released: May 18th, 2005 and June 15th, 2005
Video: MP4
Audio: MP3
Photo: JPEG
RSS Audio: No
RSS Video: No
Web Browser: Unofficially. Wipeout Pure Hack
Homebrew: No
Downgrader: Yes
New Features:
* A patch has been added to address a security vulnerability in the system software.
* UMD™MUSIC can now be played under [Music] in the home menu.
Firmware 2.00
Released: August 24th, 2005
Video: MP4, AVC
Audio: MP3, ATRAC, WAV, AAC
Photo: JPEG, TIFF, BMP, GIF, PNG
RSS Audio: No
RSS Video: No
Web Browser: Yes
Homebrew: Yes
Downgrader: Yes
New Features:
* An Internet browser has been added
* 4:3 Screen Mode has been added
* Go To feature has been added
* A-B Repeat feature has been added
* Audio options have been added
* MP4 (AVC) has been added as a playable file format
* Modified Sonicstage Makes It Possible To Have ATRAC3 Playback
* MP4 AAC and WAV have been added as playable formats
* Wallpaper feature has been added
* Image transfer feature has been added
* TIFF, GIF, PNG and BMP have been added as viewable file formats
* 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
Firmware 2.01
Released: October 3rd, 2005
Video: MP4, AVC
Audio: MP3, ATRAC, WAV, AAC
Photo: JPEG, TIFF, BMP, GIF, PNG
RSS Audio: No
RSS Video: No
Web Browser: Yes
Homebrew: Yes
Downgrader: No
New Features:
* Security Patch
Firmware 2.50
Released: October 13th, 2005.
Video: MP4, AVC
Audio: MP3, ATRAC, WAV, AAC
Photo: JPEG, TIFF, BMP, GIF, PNG
RSS Audio: No
RSS Video: No
Web Browser: Yes
Homebrew: Yes
Downgrader: Yes
New Features:
* [LocationFree™ Player]* has been added as a feature under [Network]
* [Auto-Select] and [Unicode (UTF-8)] have been added as options to [Encoding] under [View] in the [Internet Browser] menu bar.
* Settings for [Text Size] and [Display Mode] in [Internet Browser] can now be saved.
* The input history of online forms accessed through [Internet Browser] can now be saved
* Copyright-protected video can now be played under [Video]
* [Set via Internet] has been added as an option to [Date and Time] in [Date & Time Settings] under [Settings]
* [WPA-PSK (AES)] has been added as a security method under [Network Settings].
* Korean input mode has been added to the on-screen keyboard
Firmware 2.60
Released: November 29th, 2005
Video: MP4, AVC
Audio: MP3, ATRAC, WAV, AAC, WMA
Photo: JPEG, TIFF, BMP, GIF, PNG
RSS Audio: Yes, Streaming
RSS Video: No
Web Browser: Yes
Homebrew: Yes
Downgrader: Yes
New Features:
* [RSS Channel] has been added as a feature under [Network]
* [Volume Adjustment] has been added as an option in the [LocationFree Player] control panel
* [Simplified Chinese (GB18030)]* and [Traditional Chinese (Big5)] have been added as options to [Encoding] under [View] in the [Internet Browser] menu bar.
* Copyright-protected video data provided by a content provider or other services can now be downloaded directly to a Memory Stick Duo™ using the [Internet Browser].
* Music data in WMA (Windows Media® Audio) format can now be played under [Music]
- WMA9 Professional, WMA9 Lossless and copyright-protected WMA files are not supported
- Note that you must activate the [Enable WMA Playback] setting to play music data in WMA format
* Enable WMA Playback] has been added as a setting under [System Settings].
Firmware 2.70 and 2.71
Released: April 25th, 2006 and June 1st, 2006
Video: MP4, AVC
Audio: MP3, ATRAC, WAV, AAC, WMA
Photo: JPEG, TIFF, BMP, GIF, PNG
RSS Audio: Yes. Streaming and Downloadable
RSS Video: No
Web Browser: Yes
Homebrew: Yes
Downgrader: Yes
New Features:
* Using the PSP® system's [Internet Browser] feature, game demos can now be downloaded and saved on Memory Stick™ media.
* Video can now be displayed correctly when an external tuner is selected in [LocationFree™ Player].
* Macromedia® Flash® content can now be displayed in [Internet Browser]
* [Connection Settings] has been added as a setting under [Settings] in [Internet Browser] > [Tools].
* Audio content from [RSS Channel] can now be saved on Memory Stick Duo™ media
* [Automatic] has been added as an option under [Rate] in the control panel of [LocationFree™ Player
* A new file extension has been added to playable AAC formats
* [Enable Flash® Player] has been added as a setting under [System Settings].
* [Enable Flash® Player] has been added as a setting under [System Settings].
* [RSS Channel Settings] has been added as a setting.
* [UMD™Video L/R Button] has been added as an option under [Video Settings]
* Certain conditions that have occurred when using Memory Stick PRO Duo™ with free (recordable) memory space of 2 GB or more are now solved
Firmware 2.80
Released:
Video: MP4, AVC
Audio: MP3, ATRAC, WAV, AAC, WMA, 3GP
Photo: JPEG, TIFF, BMP, GIF, PNG
RSS Audio: Yes. Streaming / Downloadable
RSS Video: Yes. Downloadable
Web Browser: Yes
Homebrew: Yes
Downgrader: No
New Features:
* You can now download video and image content under [RSS Channel]
* You can now register devices via a wireless LAN access point under [LocationFree™ Player]
* You can now play AAC files with the .3gp file extension
* [Automatic] has been added as an option under [Network Settings] > [Infrastructure Mode]
* Support for the playback of content stored in [MUSIC], [PICTURE] and [VIDEO] folders at the root level of Memory Stick Duo™ media has been added
Firmware 2.81
Released: September 7th, 2006
Video: MP4, AVC
Audio: MP3, ATRAC, WAV, AAC, WMA, 3GP
Photo: JPEG, TIFF, BMP, GIF, PNG
RSS Audio: Yes. Streaming and Downloadable
RSS Video: Yes. Downloadable
Web Browser: Yes
Homebrew: No
Downgrader: No
New Features:
* Security Patch
* Certain conditions that have occurred when using Memory Stick PRO Duo™ with free (recordable) memory space of 4 GB or more are now solved.
Sources:
http://www.xtremepsp.com/ pspupdates.qj.net 
Linear Mode
