- PSP homebrew developer Davee
has finally released his PSP 6.31 / 6.35 downgrader to 6.20 Firmware for the PlayStation Portable today.
Download: PSP 6.31 / 6.35 Downgrader to 6.20 Firmware
To quote: Sony, being as sneaky as they are decided to do a rather interesting move. As researched by Coyotebean, Sony started enforcing using a public key method of verifying KIRK data and removing the ability to load the old types of data.
As they did this, firmware 6.30+ cannot decrypt the updater and the PRX inside and therefore cannot use the index.dat spoofing to downgrade.
This application does the simple job of rebooting into the updater with a PRX that allows the updater to decrypt. A PRX that uses the pspdecrypt source and index.dat spoofing, nothing fancy.
So, I’ll stop blabering, here is the Readme: 6.35/6.31 -> 6.20 Downgrader By Davee
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...