Guide
Now that you have your pandora battery and your memory stick, you should be good to go wheelo, from past experience i hear that a 512MB or 2GB work the best, but its just something i read online, i'm sure you'll be fine, i downgraded mine succesfully with a 4GB memory stick.
Just to confirm that your battery is working, when you insert into into the PSP, the screen will remain blank but the power light will automatically turn on to the green colour.
Download the following:
Code:
http://www.mediafire.com/download.php?zfkijd2rm4n
Instructions:
Have your PSP connected and in USB mode.
1) Extract the 380.PBP and Rain MMS program.
2) Run the Rain MMS program and select the following.
3) Select 3.80 OFW/M33-5 (DCv4) and click load Eboot, and select 380.pbp (downloaded file)
4) Your PSP should be detected at this stage already, check the "format memory stick" box.
5) If you have a Phat PSP then you can select "1.50 Kernal addon installer" Just under the checked box USB version fake plugin.
I repeat if you do NOT have a Phat PSP then do not select the 1.50 kernal add on otherwise you will fry your PSP!!
5) You can leave the defaull trigger button to L(Default).
6) Finally, you can now select "Make MMS", at this stage the program will format your memory stick and create the necessary index with all the files required for the downgrade.
7) Disconnect from PC and remove any batteries inserted in the PSP, and put in the memory stick.
8) Carefully put in the pandora battery, make sure it is not taken out until the process is finished.
9) The green light should now come on before (as tested earlier), aswell as the red flashing memory stick light. If the memory stick light does not come on then that means there was a fault in making the memory stick, so you will have to repeat the steps again.
10) The PSP should now display some white text, from memory, you will have to press "X" to install the 3.80 Custom firmware.
11) The downgrading will now begin, alot of text will appear on the screen, rushing down. But dont worry, this is supposed to happen.
12) You will know when the downgrade is succesful when the PSP tells you so!, it will say the downgrade is successfuly press "X" again to restart your PSP
13) Congratulations, you now have a PSP with custom firmware.