You run the application at your OWN risk. I am not help accountable if your PSP get's BRICK
Has been tested on 1k, 2k, 3k, and Go
[What does it do?]
Allows users who are incontent with their firmware to downgrade to 6.20 using the Sony Updater.
[How do I use it?]
Copy the "PSP" folder to your PSP. The downgrader is "signed" and can be launched from OFW XMB. You need to copy the 6.20 update to PSP/GAME/UPDATE/EBOOT.PBP and for PSPgo it must be the eflash it is placed on. After setup run the downgrader and follow the onscreen instructions.
[What does it technically do?]
It uses the utility/power exploit to gain kernel access and reboots into the updater with a special PRX running. This PRX uses the pspdecrypt functionality to decrypt the updater PRX when needed. This allows the updater to boot in the newer firmwares.
6.38: *add when source is released*
Davee - legend. Originally made 6.35/6.31 downgrader
bbtgp - legend. Continued updates to psardumper (pspdecrypt) and the signing application "prxEncrypter".
coyotebean - legend. Coninuted updates to psardumper (pspdecrypt) and large influence and research regarding cryptographics.
kgsws - legend. First application signed and method released.
Silverspring - legend. Lots and lots of info on KIRK where we'd still be in the dark without.
Bubbletune - BTCNF injection code and bits and bobs here ;D
Another important note: After you downgrade to 6.20, you will get a BSOD (saying that your system information is corrupted), this is OK, just click circle to reset your system information and you will be back to normal.
New version added support for 07g and 09g
6.20 PSP OFW:http://www.mediafire.com/?6gwhtdfgzif6jfl
6.20 PSP GO OFW:http://www.mediafire.com/?npjl15poj9ll1p9
Source:http://wololo.net/talk/viewtopic.php?f= ... 03&start=0