I AM NOT RESPONSIBLE FOR ANY DAMAGE THAT CAN BE CAUSED BY USING THIS DOWNGRADER.
This downgrader is compatible with PSPs up to Model 9g (PSP Go included).
To check what PSP model you have, download PSPIdent 0.75 here: http://www.mediafire.com/?pb9gccudpf8okc1
To install PSPIdent simply put the PSPIDENT folder to ms0:/PSP/GAME.
NOTE: You can only use PSPIdent if you already installed CFW on your PSP System.
1.) First of all, check what PSP Model you have to make sure your PSP is compatible. We don't want to brick the PSP do we?
(SKIP THIS STEP IF YOU ALREADY KNOW YOUR MODEL IS COMPATIBLE)
2.) If your PSP is compatible, go ahead and download 6.20 OFW and the Downgrader:
6.20 OFW PSP Go: http://www.mediafire.com/?yixdkkoaadm4scq
6.20 OFW: http://www.mediafire.com/?j0mhw8ms1u64tv9
Chronoswitch downgrader: http://www.mediafire.com/?jmvb5f9gn30265v
3.) When downloaded, extract Chronoswitch Downgrader folder into ms0:/PSP/GAME.
Then go into ms0:/PSP/GAME and make a new folder called UPDATE (Capital Letters) and extract the EBOOT.PBP from the 6.20.zip folder into the UPDATE folder.
4.) Safely unplug your PSP from the computer and start the Downgrader.
When you start it, it's going to say "Press X to continue" right after checking your firmware. Press X.
After that, Press X again to start the SCE updater and if the Downgrader worked successfully, 6.20 official update should load up.
Keep pressing Next until your PSP starts installing the update.
5.) When the update finishes, your PSP is going to restart and this is what should come up.
http://imageshack.us/photo/my-images/594/pspbsod.png/
Don't worry. It's suppose to happen. Just press O to restore your PSP settings.
6.) And you're Done!
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