PSP V2.0 to v1.5 Downgrade guide

[Kazuya vs Jin]

My psp version is 2.7

is it ok to downgrade it to 1.00 to play homebrew games like neogeo games

[Cooe14]

PLEASE READ THE LAST TWO PAGES i ALREADY STATED THERE IS NO WAY TO DOWNGRADE ANY VERSION HIGHER THAN 2.00 PLEASE LOOK BEFORE YOU POST.

[CHEMIE75]

THIS WORKS FOR ALL PSP'S Downgrader download at bottom of post.

EDIT: It seems some anti-virus programs pick up the "downgrader" as a virus. While some hacked versions do indeed contain a virus the real version is still picked up as a virus. Make sure you download the program from here. I assure you this is the official version and contains no real virus. I have tested it my self.~Kaiser

This guide is part of the Emulation/Homebrew Guide Library But is Kept stickied for easy access

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- A Homebrew Downgrade guide by Kaiser -
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REMEMBER THE DOWNGRADING PROCEDURE IS DANGEROUS. EVEN THOUGH IT HAS BEEN TESTED COUNTLESS TIMES I AM STILL IN NO WAY RESPONSIBLE FOR BRICKED PSP'S DUE TO WRONG PROCEDURE.
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The new 2.0 Downgrader for the PSP Is out, Please note that this takes
the current 2.0 Firmware and downgrades it to 1.5 Then you can load
homebrew on your PSP

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/!\ I recommend having the PSP Charged at 100% before attempting this. /!\
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If you have a 1.51 or a 1.52 you now need to upgrade your psp to a 2.0 in
order for the downgrader to work. This can either be done via the Demo
disc or if you are lucky enough to have WIFI use the update icon on the
psp. Or lastly Download the update and simply use a USB cable to transfer
it onto the psp. Below are the official Links for the Sony Updates Ive
included both JPN/US Update versions.

JPN 2.0 FIRMWARE - here
USA 2.0 FIRMWARE - here

Ok now assuming that all went well you now have yourself a PSP 2.0 Firmware
What you now need is the MPH Release Downgrader which can be obtained from the bottom of this post. Once you have downloaded this, plug the PSP into the USB cable
and it wouldnt be a bad idea to plug it into the Power point.

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/!\ I recommend having the PSP Charged at 100% before attempting this. /!\
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Now once you have downloaded the Zip Package and unzipped it with either
windows zip or winrar, winzip etc. the file layout is as follows.


x:/h.bin
x:/index.dat
x:/PSP/GAME/UPDATE/eboot.pbp (this is the 1.50 pbp eboot file)
x:/PSP/PHOTO/overflow.tif

(Where "x" is the drive your computer has given the Memory Stick)

Firmware V1.5 update eboot

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/!\ MAKE SURE THE PSP IS PLUGGED INTO THE AC ADAPTOR AND 100% CHARGED /!\
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Now Exit the USB Mode of the PSP, and goto the PHOTO MENU, this will now
launch the version changer. The PSP Light will go off after the version
changer has done it stuff.
If the PSP does not turn off automatically you can do a hard reset yourself after the required amount of time passes. Wait approx 10-15 seconds and power the PSP back on. Once it is on Enable USB Mode and check to see if the following
file exists.

MEMORYSTICK:/index.dat.bak

IMPORTANT: Please remember that your PSP is still 2.0 but it has been tricked into thinking its actually version 1.0 so you can "upgrade to 1.5"

If so all is well, goto the game menu and Launch the PSP Update and simply
follow the onscreen instructions to update your psp. The update will get to
99% and Fail, No cause for concern this is still correct. The psp will now
do a faily length restart just let it play out. Now one of two things will
happen either the PSP will restart or it will turn off. If the PSP does not turn off automatically you can perform a hard reste to turn it off. After the LED goes off and the psp has turned off.. Wait 10-15 Seconds and power the PSP back on. You now have a 1.50 PSP, Congratulations.


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- A Homebrew Downgrade guide by Kaiser -
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Idon`t if i`m doing something wrong here but when do this and go to the photo menu the overflow.tiff is seen as dmg data. can u tell how and y that is possible i d-loaded it many times now and every time it shows the same.

[m0rbidkytten]

Hey guys, I'm going through downgrading my psp it was a 1.52 updated it to a 2.0 w/o problems. I downloaded the zip file MPHDowngrader and of course my norton detects it as a virus. but its getting a file called pspbricker and removes it? Why is that file in there? the read me in the zip says nothing about a file with that name. Also it says to move the overflow.tif file into photo directory. There is NO overflow.tif in the zip file?
I'm worried that this zip file has been corrupted recently?

[Cooe14]

As long as you download it from the link in the guide your fine the overflow.tiff does not have a virus just disable norton when download it or it will delete the overflow.tiff because it thinks it has a virus in it.

[Accordion]

ahhhhhhhhhhhhhhh

[Cooe14]

Wragg needs to make a machine that eats noobs who can't read.

[q_man]

Thanx!!!!

[naldar]

I now have v 2.7 on U.S. PSP and everytime I try this proccess it says the data is corrupted.....

[Cooe14]

I now have v 2.7 on U.S. PSP and everytime I try this proccess it says the data is corrupted.....

AHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH MAKE IT SToP PLEASE!