Here is a list of PSP demos that I found on the Official Sony PSP Forums (LINK) I take no credit for this list.
Region: Foreign
Folder Name: NPJH90007
Download Link: NPJH90007.ZIP
Rating:
Region: Foreign
Folder Name: NPJH90004
Download Link: NPJH90004.ZIP
Rating:

Region: Foreign
Folder Name: ULJM91014
Download Link: ULJM91014.ZIP

Region: Foreign
Folder Name: ULJS00138
Firmware Required: 3.95 & Up
Download Link: ULJS00138.ZIP
Game: Ikuze! Gen-San Demo
Region: Foreign
Folder Name: ULJS00141
Download Link: ULJS00141.ZIP
Region: Foreign
Folder Name: NPJG90020
Download Link: NPJG90020.ZIP
File Size: 4.74 MB
Language: English
Region: North America
Folder Name: ULUS10289
Firmware Required: 3.90 & Up
Download Link: ULUS10289.ZIP

File Size: 15.3 MB
Language: English
Region: North America
Folder Name: ULKS46142
Firmware Required: 3.90 & Up
Download Link: ULKS46142.ZIP
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Game: Umihara Kawase
File Size: 3.20 MB
Language: Foreign
Region: Foreign
Folder Name: ULJS00137
Firmware Required: 3.90 & Up
Download Link: ULJS00137.ZIP
Rating:
File Size: 3.73 MB
Language: Foreign
Region: Foreign
Folder Name: NPJG90019
Firmware Required: 3.90 & Up
Download Link: NPJG90019.ZIP
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Game: Space Invaders Extreme
File Size: 5.13 MB
Language: N/A
Region: Japan
Folder Name: UJLM05315
Firmware Required: 3.80 & Up
Download Link: UJLM05315.ZIP
Rating:
Game: Dungeon Explorer #2
File Size: 4.82 MB
Language: Foreign
Region: Japan
Folder Name: NPJG90011
Firmware Required: 3.73 & Up
Download Link: NPJG90011.ZIP
Rating:

Language: Foreign
Region: Japan
Folder Name: NPJG90017
Firmware Required: 3.51 & Up
Download Link: NPJG90017.ZIP

Language: Foreign
Region: Japan
Folder Name: NPJG90016
Firmware Required: 3.51 & Up
Download Link: NPJG90016.ZIP

File Size: 78 MB
Language: English
Region: North America
Folder Name: UCUS98699
Firmware Required: 3.73 & Up
Download Link: UCUS98699.ZIP
Game: Yuusha no Kuse ni Namaiki da
File Size: 4.21 MB
Language: Foreign
Region: Japan
Folder Name: NPJG90009
Firmware Required: 3.72 & Up
Download Link: NPJG90009 ( Eboot.pbp )
Rating:
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Game: Warhammer 40,000 Squad Command
File Size: 6.26 MB
Language: English
Region: North America
Folder Name: ULUS10313
Firmware Required: 3.71 & Up
Download Link: ULUS10313.ZIP
Rating:
Game: Dungeon Explorer
File Size: 4.75 MB
Language: Foreign
Region: Japan
Folder Name: ULJM05164
Firmware Required: 3.51 & Up
Download Link: ULJM05164.ZIP
Rating:
Game: Worms Open Warfare 2
File Size: 4.00 MB
Language: English
Region: Europe
Folder Name: ULED90045
Firmware Required: 3.52 & Up
Download Link: ULED90045.ZIP
Rating:
Game: Mawaskes
File Size: 6.45 MB
Language: Foreign
Region: Japan
Folder Name: ULJS00105
Firmware Required: 3.51 & Up
Download Link: ULJS00105.ZIP
Rating:
Game: Hot Pixel
File Size: 7.87 MB
Language: English
Region: Europe
Folder Name: ULED90025
Firmware Required: 3.50 & Up
Download Link: ULED90025.ZIP
Rating:
Game: SOCOM U.S. Navy SEALs Fireteam Bravo 2 (Demo #2)
File Size: 5.67 MB
Language: English
Region: Europe
Folder Name: UCED90042
Firmware Required: 3.50 & Up
Download Link: UCED90042.ZIP
Rating:
Game: Ape Escape Saru Saru
File Size: 6.73 MB
Language: Foreign
Region: Japan
Folder Name: NPJG90004
Firmware Required: 3.50 & Up
Download Link: NPJG90004.ZIP
Rating:

Language: English
Region: Europe
Folder Name: UCED90043
Firmware Required: 3.50 & Up
Download Link: UCED90043.ZIP

File Size: 16.10 MB
Language: English
Region: Europe
Folder Name: UCED90036
Firmware Required: 3.40 & Up
Download Link: UCED90036.ZIP

File Size: 5.02 MB
Language: Foreign
Region: Japan
Folder Name: ULJM05126
Firmware Required: 3.40 & Up
Download Link: ULJM05126.ZIP

File Size: 5.17 MB
Language: Foreign
Region: Japan
Folder Name: ULJM05135
Firmware Required: 3.40 & Up
Download Link: ULJM05135.ZIP

File Size: 5.21 MB
Language: Foreign
Region: Japan
Folder Name: ULJM05189
Firmware Required: 3.40 & Up
Download Link: ULJM05189.ZIP

File Size: 7.17 MB
Language: Foreign
Region: Japan
Folder Name: ULJM05184
Firmware Required: 3.40 & Up
Download Link: ULJM05184.ZIP

File Size: 6.14 MB
Language: Foreign
Region: Japan
Folder Name: ULJM05201
Firmware Required: 3.40 & Up
Download Link: ULJM05201.ZIP

File Size: 7.20 MB
Language: Foreign
Region: Japan
Folder Name: ULJM05168
Firmware Required: 3.40 & Up
Download Link: ULJM05168.ZIP

File Size: 8.34 MB
Language: Foreign
Region: Japan
Folder Name: ULJM05123
Firmware Required: 3.40 & Up
Download Link: ULJM05123.ZIP

File Size: 8.17 MB
Language: Foreign
Region: Japan
Folder Name: ULJM05170
Firmware Required: 3.40 & Up
Download Link: ULJM05170.ZIP

File Size: 6.46 MB
Language: Foreign
Region: Japan
Folder Name: ULJS00087
Firmware Required: 3.40 & Up
Download Link: ULJS00087.ZIP

File Size: 7.89 MB
Language: Foreign
Region: Japan
Folder Name: ULJM05171
Firmware Required: 3.40 & Up
Download Link: ULJM05171.ZIP

File Size: 8.00 MB
Language: Foreign
Region: Japan
Folder Name: ULJM05128
Firmware Required: 3.40 & Up
Download Link: ULJM05128.ZIP

File Size: 42 MB
Language: English
Region: North America
Folder Name: UCUS98645DEMO
Firmware Required: 3.40 & Up
Download Link: UCUS98645DEMO.ZIP

File Size: 6.26 MB
Language: English
Region: Europe
Folder Name: ULED90040
Firmware Required: 3.40 & Up
Download Link: ULED90040.ZIP

Game: DJ Max Portable 2
File Size: 7.70 MB
Language: Foreign
Region: Korea
Folder Name: ULKS46116
Firmware Required: 3.11 & Up
Download Link: ULKS46116.ZIP
Rating:
Game: NBA 07
File Size: 78.54 MB
Language: English
Region: North America
Folder Name: UCUS98644
Firmware Required: 3.03 & Up
Download Link: UCUS98644.ZIP
Rating:
Game: Syphon Filter: Dark Mirror
File Size: 23.16 MB
Language: English
Region: North America
Folder Name: UCUS
Firmware Required: 3.03 & Up
Download Link: UCUS.ZIP
Rating:
Game: Medal of Honor Heroes
File Size: 26.20 MB
Language: English
Region: Europe
Folder Name: ULED90008
Firmware Required: 3.03 & Up
Download Link: ULED90008.ZIP
Rating:
Game: Mercury Meltdown – Europe
File Size: 6.47 MB
Language: English
Region: Europe
Folder Name: ULED00018
Firmware Required: 3.02 & Up
Download Link: ULED00018.ZIP
Rating:
Game: Mercury Meltdown – Japan
File Size: 6.52 MB
Language: Foreign
Region: Japan
Folder Name: UCJS10043
Firmware Required: 2.82 & Up
Download Link: UCJS10043.ZIP
Rating:
Game: Killzone: Liberation
File Size: 25.49 MB
Language: English
Region: North America
Folder Name: UCUS98646-Demo
Firmware Required: 3.01 & Up
Download Link: UCUS98646-Demo.ZIP
Rating:
Game: Ape Escape Racer
File Size: 8.31 MB
Language: Foreign
Region: Japan
Folder Name: UCJS10032
Firmware Required: 2.82 & Up
Download Link: UCJS10032.ZIP
Rating:
Game: LocoRoco Halloween
File Size: 8.00 MB
Language: English
Region: North America
Folder Name: UCUS98662
Firmware Required: 2.82 & Up
Download Link: UCUS98662.ZIP
Rating:

File Size: 7.68 MB
Language: English
Region: North America
Folder Name: ULUS10220
Firmware Required: 3.40 & Up
Download Link: ULUS10220.ZIP

Game: Blokus Club Portable
File Size: 5.89 MB
Language: Foreign
Region: Japan
Folder Name: ULJS00068
Firmware Required: 2.81 & Up
Download Link: ULJS00068.ZIP
Rating:
Game: MLB ’07: The Show
File Size: 156.12 MB
Language: English
Region: North America
Folder Name: UCUS98667
Firmware Required: 3.30 & Up
Download Link: UCUS98667.ZIP
Rating:
Game: Ape Academy 2
File Size: 7.31 MB
Language: English
Region: Europe
Folder Name: UCES00302
Firmware Required: 2.81 & Up
Download Link: UCES00302.ZIP
Rating:
Game: Toca Race Driver 3
File Size: 22.31 MB
Language: English
Region: Europe
Folder Name: ULED90009
Firmware Required: 3.03 & Up
Download Link: ULED90009.ZIP
Rating:
Game: LocoRoco Holidays
File Size: 7.87 MB
Language: English
Region: North America
Folder Name: UCUS98662
Firmware Required: 3.02 & Up
Download Link: UCUS98662.ZIP
Rating:
Game: Exit 2
File Size: 7.94
Language: Foreign
Region: Japan
Folder Name: ULJM05161
Firmware Required: 2.81 & Up
Download Link: ULJM05161.ZIP
Rating:
Game: MotoGP
File Size: 7.89 MB
Language: English
Region: Europe
Folder Name: UCES00373
Firmware Required: 2.81 & Up
Download Link: UCES00373.ZIP
Rating:
Game: Ridge Racer 2
File Size: 6.38 MB
Language: English
Region: Europe
Folder Name: UCES00422
Firmware Required: 2.81 & Up
Download Link: UCES00422.ZIP
Rating:
Game: Bounty Hounds
File Size: 7.99 MB
Language: Foreign
Region: Japan
Folder Name: ULJS00021
Firmware Required: 2.80 & Up
Download Link: ULJS00021.ZIP
Rating:
Game: LocoRoco
File Size: 7.87 MB
Language: English
Region: North America
Folder Name: UCUS98662
Firmware Required: 2.71 & Up
Download Link: UCUES98662.ZIP
Rating:
Game: Go! Sudoku (Kazuo)
File Size: 5.48 MB
Language: Foreign
Region: Japan
Folder Name: UCJS10036
Firmware Required: 2.71 & Up
Download Link: UCJS10036.ZIP
Rating:
Game: World Tour Soccer ’06
File Size: 17.41 MB
Language: English
Region: North America
Folder Name: UCUS98631
Firmware Required: 2.80 & Up
Download Link: UCUS98631.ZIP
Rating:
Game: World Tour Soccer 2
File Size: 2.80 & Up
Language: English
Region: Europe
Folder Name: UCES00206
Firmware Required: 2.80 & Up
Download Link: UCES00206.ZIP
Rating:
Game: Lumines 2
File Size: 7.40 MB
Language: Foreign
Region: Japan
Folder Name: UCJS05232
Firmware Required: 3.03 & Up
Download Link: UCJS05232.ZIP
Rating:
Game: LocoRoco “5″
File Size: 6.83
Language: Foreign
Region: Japan
Folder Name: NPJG90002-5
Firmware Required: 3.03 & Up
Download Link: NPJG90002.ZIP
Rating:

File Size: 5.37 MB
Language: Foreign
Region: Japan
Folder Name: NPJG90003
Firmware Required: 3.03 & Up
Download Link: NPJG90003.ZIP

Game: LocoRoco “2″
File Size: 8.42 MB
Language: Foreign
Region: Japan
Folder Name: UCJS10041
Firmware Required: 2.82 & Up
Download Link: UCUJS10041.ZIP
Rating:
Instructions
-
Download the demo from the supplied link.
-
Once downloaded, right click on the file and select “Extract All.”
-
Connect your PSP to your PC via USB 2.0 Mini cable.
-
Copy the folder that is inside the folder named after the game. (Example: LocoRoco->UCUS98662)
-
Locate the GAME folder on your PSP. (/PSP/GAME/)
-
Paste the demo folder into the GAME folder.
-
You can now run the demo on your PSP by going to the XMB -> Game -> Launch Desired Demo.
Enjoy!
