1) Download the 2.00 update if your PSP doesn't already have the 2.0 firmware on it. Make sure the update is 2.00 and NOT 2.01 or 2.50. Any 2.0 update is fine as long as it didn't come from a UMD(US, EU, and JP all work). I don't feel that I should provide a download for it here as it's Sony-copyrighted.
2) Download the 1.50 update.
3) Download MPH's downgrader.
4) Unpack the 2.00 update if it was in a ZIP or RAR file. You will end up with some sort of folders or simply an EBOOT.PBP file. If you have folders find the EBOOT.PBP file within them.
5) Attach your PSP to your computer. Enable USB by going to Settings, then USB Connection. If you have Windows XP a friendly window will pop up asking what you want to do with the drive. Say you want to explore it. Make a folder on your memory stick called PSP. It probably already exists. Make a folder called GAME inside the PSP folder. It might already exist too. Make a folder inside the GAME folder called UPDATE. Copy the EBOOT.PBP file into this folder.
6) Get out of USB mode on your PSP. Scroll over to game, then hit Memory Stick, then select the update. Make sure your PSP has over 50% battery and is plugged in.
7) Follow the on-screen instructions.
8) Unpack the MPH downgrader.
9) Put your PSP into USB mode. Browse to your Memory Stick. Copy the file called "h.bin" and "index.dat" into your Memory Stick(NOT IN A FOLDER). Then go into the PSP folder. Make a folder called PHOTO. Copy the file called overflow.tif into this folder(depending on where you got your MPH downgrader it may have unpacked a folder named PSP for you. If so just drag the PSP folder to your Memory Stick).
10) Get out of USB Mode. Scroll over to Photo and hit Memory Stick. Odd things will happen on your PSP's screen. Wait a few seconds, then hold up the power switch on your PSP to restart it.
11) Watch your PSP start up again. Go into the USB Connection.
12) Unpack your 1.50 update and copy the EBOOT.PBP just as you did for the 2.0 update. Please, please,please make sure this EBOOT.PBP did NOT come off of a UMD disc and does not contain the word Ac!d anywhere near it. These EBOOTs will break your PSP. Thankfully 99% of EBOOTs are reliable, and there's little need to be worried. The region(US, EU, JP) doesn't matter.
13) Run it. Follow the on-screen instructions. The updater will get to 99%, then give an error. Don't worry, this is normal. Wait a few seconds, then hold up the power switch to reboot the PSP. Your PSP will display the usual animation, then a blue screen in many languages. Simply press and hold O for a few seconds(it takes awhile sometimes) and you will be asked to set up your PSP.

POSSIBLE PROBLEMS:
No text in updater to 2.00. This happens if you've used a version changer that's buggy. Please just go to Settings->System->Restore Default Settings and follow the instructions. The 2.0 updater will now work.

Welcome to the wonderful world of 1.50!

Here would be a good place to go now:
http://www.psp-spot.com/forums/index.php?showtopic=3756

just downloaded the downgrader from this site and norton found the psp brick trojan straight away any ideas it also found it in the one i used to downgrade my ( EU )psp still any ideas

I got the downgrade the day it came out and now norton says its the PSPbrick. . . yeah right. This is Sony's way of minimizing the damage that they will face by thousands of systems now being able to run homebrew.

There was (to my knolage) one utill / app that did brick the PSP.
THIS IS NOT THAT APP / UTILL

However, Norton got wind of this rouge app and decided (quite rightfully) to add the detection to its virus database.

Thing is, Norton looks for something that would alter the PSP Firmware.
This Downgrader Alters the psp firmware also (but in a good way)
Norton cant tell the diffrence and reports it as BAD just to be safe

bottom line is this..
There is something out there called PSPbrick
This downgrader is not PSPbrick.

Whenever I try to upgrade to 2.0, it just fails back out to the screen with one of those 8xxxxxxxx errors, saying the game could not be started. The system is fully charged and plugged in, but it just won't run. Any ideas? I have a 1.5 system and have never used a version changer.

-EDIT-

Nevermind, I figured it out. Apparently, I named my update folder "Update", when it really needed to be named "UPDATE". Wow, now that is picky.

Shit, it really can't get any easier that this...

Got a question...
What if I upgraded to 2.0 with the GTA UMD?
Is there no way to downgrade to 1.5 now? I attempted it last night and it failed.
Thanks!

You should still be able to downgrade

Thanks for responding.
I've tried numerous times:
After I've fooled the PSP into thinking it's 1.00, I go to the game menu to run the upgrade and it tells me there is a corrupt file where the upgrader to 1.5 should be.
Please help.

That is completely wrong. You use the 2.00 to 1.5 downgrader. There is no need to fool the psp into thinking it has firmware 1.00.

um.. people i have a prob whenever i try to change from 2.01 to 2.00 i get

"The system software on your psp system is version 2.01.
There is no need to update"


what should i do ??????

i got the same thing..my psp didnt downgrade correctly...so i just upgraded but..man i miss ISO's but i dont know why the 2.01 downbgrade doesnt work some 1 plz answer me..cause i wanna find out for future reference

To everyone who is is wondering why they can't downgrade from v.2.1, the reason is quite simply because sony are a bunch of merchant bankers They've made this version even more difficult to crack, and to rub salt into the psp users wound it dowsn't offer anything new! Ive scoured the internet looking for a downgrader and everywhere ive looked ive been told it aint happenin. However there may a downgrader from v 2.5 to 2.0 coming up soon. i hope so, im desparate to use homebrew! Hope this has been helpful.

certain homebrew is able to run on v2.01-v2.05.

i hope fanjita can find a way to make the 2.5 downgarder soon! ! !

OK, I have ver 1.52. However I cannot find any of the updates to upgrade to 2.0. All I can find is the new 2.6 update. Can anyone help me out? Running hombrew sounds like alot of fun but its kinda hard to do so if i cant get the downgrader and what not. Thanks for any help in advance.



disregard found the 2.0 update

Whats PSPbrick?

PSP brick is something that loads using the overflow.tif exploit (like the downgrader) and bricks it. Rendering your PSP as useful as a brick.

ok, to clear somethings up, try googleing firmware 2.0, and most likely no, there will not be a downgrader for 2.1 and above for certain reasons, but as you might have already known, there are some very good programs and games (homebrewed ) that are avalible to be played at 2.1 and above via GTA LCS, yes you need to have gta.

does it brick

does it brick

No

SHIT! mine is 2.60

It won't brick your PSP but, it's really hard to figure out how to put your emulators and roms in your PSP using GTA(Grand Theft Auto:Liberty Cities)

It won't brick your PSP but, it's really hard to figure out how to put your emulators and roms in your PSP using GTA(Grand Theft Auto:Liberty Cities)

nice

im sure someone will mess their PSP up or do it wrong lol

most agmes are going to be hard to figure out soon like gta:lcs coz sony is 'trying' to fight/battle hopmebrew etc.

* games
*homebrew

So, since I have v 2.6 am I basically screwed untill someone can figure out how to get past Sony's crappy "make it hard to crack" policy?

Yes
you are able to run homebrew with the fanjita eboot loader

is there a way to tell what games will work on 2.1?

wow this is very helpful to me... thanks guys... where can i get iso games?

couldn't tell ya,
if you ask for iso's here again i will personally ban you.

2.6 maybe

Ok real noob question now, i have been offered a 1.5 usa psp what else do i need to do to play my backups.

cheers.

Azeluk.

why is it so popular to downgrade? more homebrews @1.5?

i must be way off than cuz it says i hav ver. 2.06. can i stil use emulators?

so since i have 2.06 i cant use n e homebrewed software?

because if thats the case than im screwed rnt i?

so downgrading your psp wud come in handy?

wudnt downgrading usually be bad? y is it good?

thanks man i needed a simple guide like this, cheers m8

alright some ppl are something and others are saying other things so i'm pretty confused this is my question.

i have a PSP firmware version 2.01 what can i do with it, or what do i need to do on my side of things to play my backed up games so i no longer need to use the UMD's i have a 2gb pro duo memory stick.

i know this must happen all the time but it would me a lot, thanks guys

You cannot downgrade and you cannot play iso's sorry.

anybody knoe how to downgrade my 2.70 to 1.50 pls help me

You cannot downgrade from anything higher than 2.00

i have a 2.01v the giga pack so can i play games like ape ascape with the eloader???
if so where can i download these files (not by any torrent) i can't do anything with iso files so if you can help
thanks.

with greats,
phoenix

WOO HOO IT WORKED!

"I got one point fi-ive!
I got one point fi-ive!!"

from what firmware did you come and how did you did it?

The only firmware he could have come down from is 2.0 since no other firmware can be downgraded. And this topic is a tutorial to downgrade.

try psp-hacks.com they got every thing

[quote name='bri3d' date='Oct 14 2005, 07:05 PM' post='22456']
1) Download the 2.00 update if your PSP doesn't already have the 2.0 firmware on it. Make sure the update is 2.00 and NOT 2.01 or 2.50. Any 2.0 update is fine as long as it didn't come from a UMD(US, EU, and JP all work). I don't feel that I should provide a download for it here as it's Sony-copyrighted.
2) Download the 1.50 update.
3) Download MPH's downgrader.
anewayz is der a downgrader 4 v2.6 plz send me a meSage