http://boardsus.playstation.com/playstation/board/message?board.id=ps

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this is just a reupload of PSP Dude12345's thread. HE's the guy behind these demos uploads... i just reupload them (well.. only the ones that still valid) to a different site..that's all.
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**PSP Dude12345's contributions***
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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.

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+++++Killzone Liberation and Metal geare solid portable ops DEMOS support ad hoc mode, so play the game against (a) friend(s) +++++

****For North America games demos go here
http://www.us.playstation.com/Media#Page=1&PageSize=15&Consol

Game: Dungeon Explorer
File Size: 4.75 MB
Language: Foreign
Region: Japan
Folder Name: ULJM05164
Firmware Required: 3.51 & Up
Dungeon Explorer.rar (4.76 M http://www.megaupload.com/?d=P92T9IRT

Game: Mawaskes
File Size: 6.45 MB
Language: Foreign
Region: Japan
Folder Name: ULJS00105
Firmware Required: 3.51 & Up
Mawaskes.rar (6.47 M http://www.megaupload.com/?d=YEXEWWF2

Game: Xyanide Resurrection
File Size: 7.93 MB
Language: English
Region: Europe
Folder Name: UCED90043
Firmware Required: 3.50 & Up
Xyanide Resurrection.rar (7.93 M http://www.megaupload.com/?d=XIP94AU8

Game: Smash Court Tennis 3
File Size: 16.10 MB
Language: English
Region: Europe
Folder Name: UCED90036
Firmware Required: 3.40 & Up
Smash court tennis 3.rar (16.19 M http://www.megaupload.com/?d=8S6ZZWMP

Game: Brain Trainer Portable 2
File Size: 5.02 MB
Language: Foreign
Region: Japan
Folder Name: ULJM05126
Firmware Required: 3.40 & Up
Brain Trainer Portable 2.rar (5.02 M http://www.megaupload.com/?d=39P8NOFY

Game: Homestar Portable
File Size: 7.17 MB
Language: Foreign
Region: Japan
Folder Name: ULJM05184
Firmware Required: 3.40 & Up
Homestar Portable.rar (7.17 M http://www.megaupload.com/?d=DID8364L

Game: Gurumin: A Monstrous Adventure
File Size: 8.34 MB
Language: Foreign
Region: Japan
Folder Name: ULJM05123
Firmware Required: 3.40 & Up
Gurumin A Monstrous Adventure.zip (8.35 M http://www.megaupload.com/?d=YD6KMNEP

Game: Eiyuu Densetsu: Sora no Kiseki FC
File Size: 8.17 MB
Language: Foreign
Region: Japan
Folder Name: ULJM05170
Firmware Required: 3.40 & Up
Eiyuu Densetsu Sora no Kiseki FC.rar (8.19 M http://www.megaupload.com/?d=D7JILFWR

Game: Practical Intelligence Quotient 2
File Size: 6.46 MB
Language: Foreign
Region: Japan
Folder Name: ULJS00087
Firmware Required: 3.40 & Up
Practical Intelligence Quotient 2.rar (6.47 M http://www.megaupload.com/?d=EVHVAPQQ

Game: Boku wa Koukuu Kanseikan: Airport Hero Narita
File Size: 8.00 MB
Language: Foreign
Region: Japan
Folder Name: ULJM05128
Firmware Required: 3.40 & Up
Boku wa Koukuu Kanseikan Airport Hero Narita.rar (8 M http://www.megaupload.com/?d=KFW48OYA

Game: Metal Gear Solid: Portable Ops
File Size: 6.26 MB
Language: English
Region: Europe
Folder Name: ULED90040
Firmware Required: 3.40 & Up
Metal Gear Solid portable ops.rar (6.27 M http://www.megaupload.com/?d=081V4IBT

Game: DJ Max Portable 2
File Size: 7.70 MB
Language: Foreign
Region: Korea
Folder Name: ULKS46116
Firmware Required: 3.11 & Up
DJ Max Portable 2.zip (7.7 M http://www.megaupload.com/?d=Q4UKC49T

Game: Medal of Honor Heroes
File Size: 26.20 MB
Language: English
Region: Europe
Folder Name: ULED90008
Firmware Required: 3.03 & Up
Medal of Honor Heroes.rar (26.19 M http://www.megaupload.com/?d=7LWWGN6M

Game: Mercury Meltdown - Europe
File Size: 6.47 MB
Language: English
Region: Europe
Folder Name: ULED00018
Firmware Required: 3.02 & Up
Mercury Meltdown (E).rar (6.48 M http://www.megaupload.com/?d=IPW6DPOS

Game: Ape Escape Racer
File Size: 8.31 MB
Language: Foreign
Region: Japan
Folder Name: UCJS10032
Firmware Required: 2.82 & Up

Game: Blokus Club Portable
File Size: 5.89 MB
Language: Foreign
Region: Japan
Folder Name: ULJS00068
Firmware Required: 2.81 & Up
Blokus Club Portable.rar (5.89 M http://www.megaupload.com/?d=39Z2XNHB

Game: Ape Academy 2
File Size: 7.31 MB
Language: English
Region: Europe
Folder Name: UCES00302
Firmware Required: 2.81 & Up
Ape Academy 2.rar (7.31 M http://www.megaupload.com/?d=NDPQEK7M

Game: Toca Race Driver 3
File Size: 22.31 MB
Language: English
Region: Europe
Folder Name: ULED90009
Firmware Required: 3.03 & Up
Toca Race Driver 3.rar (22.3 M http://www.megaupload.com/?d=CLTJGZGA

Game: Exit 2
File Size: 7.94
Language: Foreign
Region: Japan
Folder Name: ULJM05161
Firmware Required: 2.81 & Up
Exit 2.rar (7.96 M http://www.megaupload.com/?d=4EHEFSIW

Game: MotoGP
File Size: 7.89 MB
Language: English
Region: Europe
Folder Name: UCES00373
Firmware Required: 2.81 & Up
MotoGP.rar (7.89 M http://www.megaupload.com/?d=Y354KWH0

Game: Ridge Racer 2
File Size: 6.38 MB
Language: English
Region: Europe
Folder Name: UCES00422
Firmware Required: 2.81 & Up
Ridge Racer 2.rar (6.8 M http://www.megaupload.com/?d=8UGB793C

Game: Bounty Hounds
File Size: 7.99 MB
Language: Foreign
Region: Japan
Folder Name: ULJS00021
Firmware Required: 2.80 & Up
Bounty Hounds.zip (8 M http://www.megaupload.com/?d=T60C00HC

Game: Doko Demo Issho: Let's Gakkou!
File Size: 5.37 MB
Language: Foreign
Region: Japan
Folder Name: NPJG90003
Firmware Required: 3.03 & Up
UCUS98655.rar (8.37 M http://www.megaupload.com/?d=M6XOQ0B6