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12-25-2005, 03:18 PM
| | | | Possible Downgrade For All Versions
Hello i´m portuguese and i have a psp v2.01. Today i found this Quote:
Hola de nuevo.
En vista de como están las cosas, me he puesto manos a la obra.
Esto como casi todo, tiene que tener una solución facil.
Muchas veces nos complicamos la vida buscando o fabricando cosas dificilisimas, cuando la solución es tan sencilla que no la vemos.
Como ya dije, tengo una PSP a 1.5 y otra a 2.5
Dandole vueltas al tema he hecho lo siguiente:
En la PSP 2.5 meto el UMD DEMO que viene con ella y lleva la actualización 2.0
Le doy a Ok y me dice que mi PSP tiene la 2.5 y que no necesito actualizar.
Vale, hasta aqui todo correcto.
Deducción:
La PSP en la Bios lleva una rutina de comprobación.
Si tengo una versión superior a la que intentan instalarme, le digo que najas.
-------------------------------
If ver update < ver BIOS then
go to ERROR.
else
update
end if
end
-------------------------------
No es esta rutina, solo es un ejemplo.
Efectivamente lo que es complicado es modificar esta rutina en la propia PSP y para ello usamos un xploit.
ESTA ES LA FORMA DE COMPLICAR LO FACIL
Si Mahoma no va a la montaña, que sea la montaña la que vaya a Mahoma.
Manos a la obra:
Cojemos el EBOOT.PBP de la versión 1.5
Le cambiamos la extensión a BIN.
Lo abrimos con un editor hexadecimal y veremos lo siguiente:
---------------------------------------------------
PBP ( T Q2 Q2 Q2 Q2 Q2 ;9 PSF Œ . 5 € ; # € ˜ C € K # € ˜ S € [ % € ˜ c € k € ˜ s ) € { ˜ BOOTABLE CATEGORY DISC_VERSION PARENTAL_LEVEL REGION TITLE TITLE_0 TITLE_2 TITLE_3 TITLE_4 TITLE_5 TITLE_6 TITLE_7 TITLE_8 UPDATER_VER MG 1.00 € PSPâ„¢ Update ver 1.50 PSPâ„¢ アップデート ver 1.50 Mise à jour PSPâ„¢ ver. 1.50 Actualización de PSPâ„¢ ver. 1.50 PSPâ„¢-Aktualisierung Ver. 1.50 Aggiornamento della PSPâ„¢
ver. 1.50 PSPâ„¢-update versie 1.50 Actualização PSPâ„¢ ver 1.50 Обновление PSPâ„¢ вер. 1.50 1.50 ‰PNG
IHDR P yÌk[ gAMA ¯È7Šé tEXtSoftware Adobe ImageReady
----------------------------------------------------
Modificamos todos y cada uno de los valores 1.50 por otro valor, en mi caso he probado a modificarlos a 1.51(Cuidado con lo que haceis al modificar, el tamaño del archivo ha de ser exactamente igual que el original)
Una vez acabado, lo guardamos.
Le volvemos a cambiar la extensión a .PBP
Lo cargamos en la PSP via USB y lo metemos en la carpeta GAMES/UPDATE.
En la PSP nos vamos a Games y elegimos la Memori Stick
EH VOILÁ!
Actualización de PSP ver 1.51
Acabamos de engañar a la PSP.
Resumiendo:
Si tenemos la versión 2.5 por ejemplo modificamos la 1.5 a la version 2.52 de tal modo que la PSP se piense que verdaderamente la version que intentamos meter es mas alta cuando en realidad es la 1.5
No he podido probarlo en la 2.5 hasta ahora porque no la tengo aqui.
Pero en la 1.5 le he metido la 1.5 modificada a 1.51 y me ha funcionado perfectamente.
Que alguien lo pruebe sin correr riesgos, (Sin actualizar de verdad, sin pulsar al OK)aunque solo sea para ver que lo que digo es cierto.
Creo que ahora si vamos por el buen camino.
Saludos
| I have fear to brick my psp with that and i no experimented that.
Sorry my bad english |
12-25-2005, 03:19 PM
|  | Senior Member | | Join Date: Nov 2005 Age: 20
Posts: 2,350
Points: 6.46 Donate | | | I understand this somewhat. |
12-25-2005, 03:21 PM
| | | | you want a tranlation to english? if you want i try to translate |
12-25-2005, 03:23 PM
|  | Senior Member
My Mood:  | | Join Date: Nov 2005 Location: Locoroco land
Posts: 1,671
Points: 8.59 Donate | | ok errr post the site then google the site and you can get a tanslation  |
12-25-2005, 03:26 PM
| | | Senior Member | | Join Date: Nov 2005 Age: 20
Posts: 2,350
Points: 6.46 Donate | | | Yea you might want to translate it for some. Im hispanic and some of this can be translated using Spanish, but not all of it. |
12-25-2005, 03:28 PM
|  | Senior Member | | Join Date: Nov 2005 Location: United Kingdom Age: 17
Posts: 1,165
Points: 0.75 Donate | | | TRANSLATED THIS MEANS
Hello again. In view of as they are the things, I have put hands to the work. This like almost everything, must have a facil solution. Often complicamos us the life looking for or making things dificilisimas, when the solution is so simple that we do not see it. As I already said, I have a PSP to 1,5 and another one to 2,5 Giving him returned to the subject I have done the following thing: In PSP 2,5 I put the UMD DEMO that comes with her and takes the update 2,0 I give Ok and it says to me that my PSP has the 2,5 and which I do not need to update. Bond, until aqui all correct one. Deduction: The PSP in the Bios takes a verification routine. If I have a version superior to that tries to install to me, I say that najas to him. If to see update |
12-25-2005, 03:30 PM
| | | Senior Member | | Join Date: Nov 2005 Location: United Kingdom Age: 17
Posts: 1,165
Points: 0.75 Donate | | Quote: |
Originally Posted by KyleNic Hello again. In view of as they are the things, I have put hands to the work. This like almost everything, must have a facil solution. Often complicamos us the life looking for or making things dificilisimas, when the solution is so simple that we do not see it. As I already said, I have a PSP to 1,5 and another one to 2,5 Giving him returned to the subject I have done the following thing: In PSP 2,5 I put the UMD DEMO that comes with her and takes the update 2,0 I give Ok and it says to me that my PSP has the 2,5 and which I do not need to update. Bond, until aqui all correct one. Deduction: The PSP in the Bios takes a verification routine. If I have a version superior to that tries to install to me, I say that najas to him. If to see update | i dont understant the end bit but i think i got the jist of it |
12-25-2005, 03:30 PM
| | | | it says that if you modify the text inside the firmware file, you can present to your psp a 1.50 foirmware like a 2.xx firmware or 3 or 4...
It seems too easy...but if you replace in a 1.50 eboot with a text editor all the "1.50" with "3.00" it looks the file as an update...
Someone "hero" try it!!!
Last edited by sbalzo : 12-25-2005 at 03:36 PM.
|
12-25-2005, 03:33 PM
| | | Senior Member | | Join Date: Nov 2005 Location: United Kingdom Age: 17
Posts: 1,165
Points: 0.75 Donate | | Quote: |
Originally Posted by sbalzo it says that if you modify the text inside the firmware file, you can present to your psp a 1.50 foirmware like a 2.xx firmware or 3 or 4...
It seems too easy... | thats what i was thinking but none the less i think it should be tried |
12-25-2005, 03:34 PM
| | | Senior Member | | Join Date: Nov 2005 Age: 20
Posts: 2,350
Points: 6.46 Donate | | | Yeah, I think some people have tried this already. It doesnt work. | |
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