Here are two automatic installers. One will downgrade your PSP to 1.5 and the other installs Devhook 0.46. I have personally tested both. Enjoy! No passwords needed


PSP Automatic Downgrader: Downgrade from 2.71 to 1.5

Code:
[Only Registered users can see links . Click Here To Register...]


How to downgrade your PSP from 2.71 to 1.50
This guide will show you how downgrade your PSP to a 1.50 and play ISOs and UMDs that require

2.xx to play.Plus you can use all of the features of 2.71 without upgrading from 1.50.

Note:If your PSPs motherboard is a TA-082 this will not work with your PSP.


What you'll need:

PSP with 2.71 firmware (upgrade to 2.71 here)
A way to tranfer files into PSP
Device Hook 0.46 (Download) (21.1Mb)
Downgrader

Step one:
Upgrade your psp to 2.71 if it isn't already.
Step two:
Launch Downgrader2.71FULL.exe and follow the instructions.
Note: If the screen doesn't turn red when you go to the photo menu it is safe to reboot your

psp and try again.After finish, connect your PSP to PC or put the MS into MS reader.

Step three:
Run Device Hook 0.46.When asked, select to install DevHook 0.46 with firmware 2.71 and then

select your memory stick.

Step four:
Put any .ISO file in the ISO folder which should now be located in the root of your memory

stick.

Now turn your PSP on and go to the Game menu and run Decive Hook PSP Firmware Emulator. To

run an ISO or UMD use these settings:
(You need a Game or Demo UMD in your PSP for devhook to work)

UMD SELECT: select the iso, cso, or umd you want to play
UMD MOUNT: ISO ANY UMD
UMD Version: no change
Firmware: 2.71
CPU Clock: 222 MHz
BOOT SELECT: Reboot XMB

To return to 1.50 reboot the PSP.



DevHook 0.46 Ultimate Installer with 2.71 Firmware

Easy to use, just run the software and follow the instructions on screen.

Code:
[Only Registered users can see links . Click Here To Register...]


Description:
v0.46 / v1.1 Easily install DevHook v0.46 with ChaosZero's Ultimate Installer v1.1! Ultimate Installer v1.1 includes:

* Install Default DevHook 0.46 with 2.71 Firmware
* Add Bleach Custom Pack - 0.46 version
* Add Naruto Custom Pack - 0.46 version
* Return DevHook to Stock
* Install 2.60 Firmware for DevHook
* Install Mod Pack (USB/Screnshot/No Autorun) - 0.44/0.45/0.46 version
* Install JAP Reg .ZIP for Manual install (Swapped X and O)
* Install CISO Tools
* Install X5 Web Portal
* Install DevHook 0.46 Update

link doesnt work