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本帖最后由 フェニックス 于
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更新内容：
支持未来发布的Infinity，类似620的Permanent Patch，简单说就是661的自制系统可以关机了
将任意系统版本的官方固件升级包放入PSP/GAME/UPDATE/
名字为EBOOT.PBP
例：PSP/GAME/UPDATE/EBOOT.PBP
测试：6.61LME2.3 插件过多造成运行死机
6.61官方系统运行OK
此软件可让高版本系统运行低版本的官方固件升级包
警告：降级有风险，请保持PSP电量在75%以上，并确保电池没有突然断电的问题
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Chronoswitch Downgrader
[VERSION 7.0]
& & -& Added support for Infinity
[VERSION 6.1]
& & -& Added support for 11g units to 6.60
[VERSION 6]
& & -& Added support for 6.61
[VERSION 5]
& & -& Added support for 09g units to 6.20
[What does it do?]
Allows users to downgrade their PSP 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?]
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.
6.60: Uses sceNetMPulldown to gain kernel access.
6.61: same as 6.60 (only certloader kexploit is patched in 6.61)
Davee - legend. Originally made 6.35/6.31 downgrader
some1 - legend. 6.38/6.39/6.60 support.
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 andD
qwikrazor87 - 6.61/11g support.
You run the application at your OWN risk. This software is free and has no warranty.
[Open Source]
Chronoswitch is open source! Get the source here:
Follow me on twitter: @DaveeFTW

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这个是降级到多少啊
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刚刚试了然并卵，依然不能把最后一批出厂的09G 6.60 降回6.20
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wyswlg520 发表于
刚刚试了然并卵，依然不能把最后一批出厂的09G 6.60 降回6.20
这个是6.61 Infinity专用的，听我群友说官方6.61用Downgrader 6.0的降级程序把6.61降到官方6.60，再降到6.20。不过据说，6.61 Infinity用这个降级容易中招。
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