How to downgrade from 3.71-m33 to 3.40 OE-A (HELP!!!)

[crazyl69]

    To begin, I have a psp fat that use to have cfw 3.40 OE-A. While flashing a custome theme, accidentally I left out a few files. After I was done flashing and exit the proccess, is when I realize that I had a problem on my hands. The psp became semi bricked. Having a pandora battery and a 1gb memory stick, already set up with cfw 3.71-m33 files, I went ahead and put in the battery and memory stick. Almost immediately, the psp became unbricked. At this point, I had no choice but to install cfw 3.71-m33 and continue with the proccess. The psp began to function normal again but I seriously would like to down graded back to cfw 3.40 OE-A. This is the way it was before the flashing. Would anybody tell what are my options or need to do. THANKS....

[Electro]

U still on the good 3.40 eh.

I'm on 3.52M33-4 at the moment myself.
But I usually use 3.71M33-4.

Anyway..

U need the 3.71M33 Recovery Files to recover back to 1.50.
From there U can update back to 3.40 OE-A.

Link to 3.71M33 Recovery Files: http://dl.qj.net/dl.php?fid=14678
Link to Sony's 1.50 EBOOT UPDATE: http://www.psp-hacks.com/download.php?id=4

How to use:
ONLY FOR A FAT PSP (PSP-1000)
* Copy the entire content of the attached file to PSP\GAME folder.
* Rename Original FW 1.50 file to UPDATE.PBP and copy it to PSP\GAME\UPDATE folder.
* In the Game menu launch "Update to X.Y.Z."
* Follow the onscreen instruction and it's done in a while.

[crazyl69]

    Thank You Electro for your time and help. As soon I get some free time, I'll go ahead with the provided links and download the new files. Hope this works.

[Electro]

This works, I have used it more then ones on my PSP.

[crazyl69]

     You are dead right Electro, this surely work for me. I'm back to cfw 3.40 OE-A. Once again, you're the man. THANKS....

[Electro]

Haha,  I didn't even realize I was helping the same person.   

[crazyl69]

     SURPRISE!!!!! GOTCHA!!!! Cool Dude...