Settimana di fuoco per la scena psp....prima il modchip,poi il kernel su 2.50/2.60 ed ora quello che molti utenti stavano aspettando:un downgrade per psp 2.50/2.60.
Rilasciato da Dark_Alex (per chi non lo sapesse lui è il creatore del dax ziso loader)questo downgrade che per ora non upperemo in attesa di maggiori riscontri,è stato provato da PSPXNAX sulla sua psp 2.60,che dopo il "trattamento" è diventata una 1.50.
Per ora accontentatevi delle spiegazioni tecniche su questo downgrade e del metodo con cui si eseguirebbe.
Piccola nota:questo downgrade sembra non funzionare sulle psp equipaggiate con scheda madre TA-082.

To be used at your own risk. It is an UNTESTED software!

This is an *experimental* downgrader for 2.50/2.60. Experimental means here that it has not been tested on a real device, althought it has a theoretical base that it could work.

This software is free and untested, and i'm not responsable if it causes damages to your PSP. If you use this software, you agree that you are using this program at your own risk and that you won't blame the author for that.

"Someone told me that a downgrader for 2.50/2.60 was impossible. How does this work?"

This one uses another more risked technique (and i repeat: untested) than the MPH downgrader. It uses some sony libraries found in the 1.50 updater to perform the most critical steps, the logical format of the flash, and the ipl writing. See technical details for more info about how it works.

This software requires that someone with a 1.50 runs a little program and send you the output so you can init the downdate process. The 1.50 program is TOTALLY safe, it only dumps the flash of a 1.50 user and it also extracts some special prx's found in the 1.50 updater.

If you do not wish to have someone with a 1.50 do it for you, you can use the included MS_ROOT folder with the files in it instead. Inside is the "DOWNDATER" folder you can use with a 2.50/2.60 PSP to test the downgrade.

Instruction for the 1.50 user
-----------------------------

1) Copy the folders downhelper and downhelper% from the folder 1.50 HELPER folder to
/PSP/GAME/ in your memstick.

2) Obtain the 1.50 update EBOOT and put it in /PSP/GAME/UPDATE in your memstick.

3) Init the downhelper program.
It will dump your flash and some files from the updater eboot to the memstick.

4) After that, the program will exit. You can now delete the updater from /PSP/GAME/UPDATE

5) You'll notice that you have a new folder in the root of your memstick called "DOWNDATER".
That's the folder you'll have to send to a 2.50/2.60 to let him test the downgrade.



Instructions for the 2.50/2.60 user
-----------------------------------

1) Copy the folder the DOWNGRADER/2.50/DOWNDATERTEST if you have 2.50
or DOWNGRADER/2.60/DOWNDATERTEST if you have 2.60 to /PSP/GAME/ in your memstick

2) Wait someone with 1.50 to pass you a folder called DOWNDATER and copy it to the root of your memstick.

3) Init GTA and the GTA Loader

4) In the GTA Loader menu, choose the downdater test. WARNING: the program won't output any display and any warnings, it will init the downgrader process inmediatelly.

5) You'll see the your memstick flashing. That means that your PSP is being flashed from the memstick.
You won't see any type of output in the screen (this is for safety). When the memstick finishes of
flashing, WAIT at least a minute, and then reinit your PSP by holding the power button.

6) That's all. If all went right, you'll have 1.50. If it went less good, you'll still have
2.50/2.60. If all went wrong, you'll have a broken PSP (except in the case you have
the mod-chip) Remember that you have accepted that risk.


Technical details
------------------

This program performs the following operations.

- It loads the ipl_update.prx and lflash_fatfmt.prx from the 1.50 updater.

- It performs a logical format of the flash0 partition using the function
sceLflashFatfmtStartFatfmt found in the lflash_fatfmt.prx

- It writes a dump of the 1.50 flash0 to the flash0.

- It writes the Initial Program Loader (Ipl) using the functions sceIplUpdateClearIpl
and sceIplUpdateSetIpl from the ipl_update.prx module. The ipl is embedded in that module.


Other considerations:
--------------------

- Users with TA-082 psp's shouldn try this. Also, it may be better that at the beginning, only users with a 2.50/2.60 NOT from factory (they updated from a below firmware) try this.

-Dark_AleX