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 6.39/6.38/6.35/6.31 -> 6.20/6.35 Downgrader By Davee, ported to 6.38/6.39 by some1

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PostSubject: 6.39/6.38/6.35/6.31 -> 6.20/6.35 Downgrader By Davee, ported to 6.38/6.39 by some1   Tue May 24, 2011 9:19 pm

6.39/6.38/6.35/6.31 -> 6.20/6.35 Downgrader By Davee, ported to 6.38/6.39 by some1

[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.
6.38/6.39: *add when source is released*

[I'm a dev, sup?]
*add when source is released*

[Credits]
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 Originally made 6.35/6.31 downgrader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

[READ]
You run the application at your OWN risk. I am not help accountable if you PSP fucks up.

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6.39/6.38/6.35/6.31 -> 6.20/6.35 Downgrader By Davee, ported to 6.38/6.39 by some1
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