6.3X(含6.39)降級6.20程式發布

happytvgame

http://mobiles.gx-mod.com/modules/news/article.php?storyid=9631

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

[這個程式能做什麼?]
讓使用者可以升級官方的6.20更新.

[我如何使用它?]
將壓縮檔內的 "PSP" 資料夾拷到你的PSP記憶卡根目錄下，先執行降級程式它會去執行PSP/GAME/UPDATE/EBOOT.PBP(6.20官方升級檔)如果是 PSPgo 請下載pspgo專用的6.20升級程式。

[What does it technically do?]
6.20-6.35: 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: It uses my http_storage exploit to gain kernel access.  Basically, http_storage has a vulnerability in it, where I can write -1 to anywhere in memory. (I'll make a post to explain it more in-depth soon)

[I'm a dev, sup?]
The source is included in the download package.

[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 Originally made 6.35/6.31 downgrader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.