View Full Version : Downgrading

March 25th, 2008, 14:08

I'm an ex-psphomebrew user. I used the gta lcs hack back in the day, maybe 2 years ago. Then, I accidentally updated my psp. Then I sold it.

Now, I bought a new one, because being on the road is no fun with a laptop that dies after an hour of any sort of cpu stress at all (even pscs3 runs it's battery like madness!)

Anyway, I was wondering if it was at all possible to downgrade the 3.90. I want it to be like the good ole' days, playing mario 64 @ ~5 fps! lol...

Good Day!

March 25th, 2008, 14:10
Yeah you can use the Pandora Battery downgrader but you need another homebrew enabled PSP.


And Mario 64 now runs at 90% :D

March 25th, 2008, 14:12
So this Pandora Battery is just a file, not an actual battery?

March 25th, 2008, 14:13
Yep, it modifies your battery to work as the Jigkick battery Sony uses to unbrick their PSP's.

March 25th, 2008, 14:16
No idea what that means!

Well that name is certainly misleading! Now I have to hunt down one of my friends who has homebrew or this hack or something.

Is that file on the link you sent me the latest version?

Thanks for the help.

March 25th, 2008, 14:39
Now I'm a little confused. Why do I need another PSP when the tutorial mentions nothing of needing one?


March 25th, 2008, 14:43
But as with all of these, nothing is garunteed, adn YOU MUST HAVE ACCESS TO A NONBRICKED PSP

That's what the quote says. And what they mean by a "NONBRICKED PSP" is a homebrew enabled one..

March 25th, 2008, 14:45
Oh lol. From what I remember bricked means useless. Like just the light works.

March 25th, 2008, 15:04
Pandora's Battery is regular PSP battery that has had its serial number changed to all 1's.
When the PSP boots it checks the serial number of the battery.
If it detects a battery with all 1's it goes into service mode and attempts to boot some files from a specially formated memory stick.
You can still use the memory stick as normal after its been formated.
The Battery can technically still be used as normal if you further modify the memory stick,
other wise it will need to have its serial number restored if you want to use it as normal again.

Making the memory stick is easy with an application like this:
Pandora CMD 150 371 380 (http://www.dcemu.co.uk/vbulletin/showthread.php?t=99709)
There are basically 3 versions of the memory stick.
Each one has the ability to directly flash the PSP to either 150, 371 or 380.

However, the Battery is a little harder to get.
1. It must be created on a modified PSP that can run the application that changes the serial number
2. or it can be hard modded by snipping a few pins on the batteries eeprom that disables the serial number.
Suffice to say the later is much harder to reverse.
3. You can also buy a battery from Datel that is specially made only for this purpose
Datel Battery Tool (http://www.consolesource.com/ecomm/catalog/ModChips-orderby0-p-1-c-244.html)

The original Pandora battery files along with the battery conversion application is here:
Pandora's Battery (http://www.noobz.eu/joomla/news/unbricker-for-all-firmwares.html)

What makes Pandora so special?
1. It has the ability to un-brick almost any PSP.
2. Flash any PHAT PSP to 1.5, 3.71M33 or 3.80M33
Remember that SLIM PSP's can only be flashed with 3.71M33 or 3.80M33
3. Make full "NAND" dumps of your PSP
This makes it possible to quickly return to any PSP firmware version you have made a dump / backup of.
A NAND refers to the chip that contains firmware or operating system of your PSP.

So it really makes sense to get one.
Use it, cherish it.

A few links to get you started:
Dark-AleX - PSP Developer (http://www.dark-alex.org/)
PlayStation Portable homebrew (http://en.wikipedia.org/wiki/PlayStation_Portable_homebrew)
PSP Firmware (http://www.psp-hacks.com/category/36)

March 25th, 2008, 15:34
Thanks Micronut. So this is what I will have to do

Put files on my memory stick

run that program that makes my battery's serial change


Could someone add me to aim

I'm completely lost!

March 25th, 2008, 15:55
Just like Xandu said you will need a modified PSP to change the batteries serial number which you don't have.
You have 2 other options available to you.
Read again.

March 25th, 2008, 16:48
So I have been trying to figure this out for the past 24 hours. Seems like you need a Pandora's battery to downgrade to get Homebrew, and if you want a Pandora's battery you need to format the battery with a PSP with Homebrew already on it. Hmmmm... Confucius say conundrum.

March 25th, 2008, 17:07

Found this but you have to physically crack open your battery. Really hoping to avoid this but since I do not have access to another PSP with Homebrew already on it I think it is my only option.


March 25th, 2008, 17:10
Yes that an option that I mentioned in my post
Did you read it?
You have 3 options.

March 25th, 2008, 21:13
Yes that an option that I mentioned in my post
Did you read it?
You have 3 options.

Sure did MicroNut. Just thought it was the least desireable of all the options. Looks like I don't have any other options unfortunately. Still not seeing a foolproof way of doing it without:
A) Spending money and destroying a battery.
B) Knowing someone that has a spare PSP that happens to have Homebrew on it.

March 26th, 2008, 06:41
I dunno, but buying a Datel tool battery sounds pretty fool-proof to me, if you're unwilling/unable to mod a battery yourself.

I wouldn't say Pandora-izing a battery is necessarily destroying a battery either, it's always wise to have one incase anything goes wrong, or you'd just like to be able to freely go from firmware to firmware.

March 26th, 2008, 09:20
Well you don't have to destroy the battery with a hard mod. (even though thats easy to do)
Technically it is reversible or you can install a switch.
But it is the hardest and if you not savvy with type of thing its best avoided.

Changing the serial number of the battery does not destroy it and it is reversible. (Although not a wise thing to do)
Like I said it also possible to use a Pandora battery as normal if you know who to further modify the boot processes on the memory stick.
You "could" run on AC power until you figure out how to modify you memory stick to dual boot.

Why not buy a Datel Battery TOOL?
As "No_one_in_particular" pointed out (lol)
That seems like a pretty fool proof way to go.
(Although its not possible to Dual boot to one)

A Pandora Battery is an extremely wise thing to own if you want custom firmware on your PSP.
The amount of time and agony you save if something goes wrong is well worth the investment.
Its the ultimate insurance.

Ultimate warrior
March 26th, 2008, 19:12

That link will lead you to make a magic memory stick and a Pandora's Battery (although I HIGHLY suggest you just buy one). When it gets to the optional step of upgrading your firmware, go for m33 3.71-4 instead of 3.71-3,since the -4 version has less bugs in it. Also, I would highly suggest you not upgrade to anything after 3.71-4. Just stick with 3.71-4 as it runs PS games the best, and since all you want to do is emulate games, you won't need to upgrade your CFW at all. Need any help just PM me. I will be glad to answer all of your questions!