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下面的说明来自pspupdates论坛
I've used this program myself and I can say that it is safe and it does work, IF you follow the directions.
我已经用过这个程序，安全，并且确实有用，只要你遵循下面的指引。
Downgrading from 2.0 to 1.5
从2.0降级到1.5
The following two files are necessary...use any of the mirrors as needed.
http://www.omlette.net/psp/MPHDowngrader.zip
http://www.omlette.net/psp/EBOOT_1.50.zip
下载上面两个文件
This will ONLY WORK on a 2.0.
仅仅可用在2.0版上（1.51和1.52请先升级到2.0）
1) You need to unzip the files MPHDowngrader.zip and EBOOT_1.50.zip. Use a program such as WinRAR, 7Zip, or WinZip (check Google). Once they are unzipped, you're ready to begin.
解压上述两个文件
2) Set up a USB connection with your PSP and your computer.
打开USB连接
3) Once the connection is set up, open up My Computer and browse to the removable disk that is your PSP. You'll need to set a few things up here.
PSP将会显示为“可移动磁盘”
4) When you first double click to open up the PSP on your computer, you'll be in what's called the root menu. There will be a PSP folder showing if you are in the right place.
双击打开的文件夹叫根文件夹，里面应该有一个PSP的文件夹
5) Copy over to your PSP the following files to THIS location in the root folder...NOT in the PSP folder or any other folder. Index.dat and h.bin should both be in your root directory.
将Index.dat 和 h.bin拷贝至根文件夹，而不是PSP文件夹或其他文件夹
6) Once this is done, open up the PSP folder and then open up the Photo folder. Here, you will copy overflow.tif over, keeping it in the Photo directory and not a sub directory.
然后打开PSP文件夹，打开PHOTO文件夹，将overflow.tif 拷贝进去
7) Now, go back to the PSP directory and go into the Game directory. If there is not already, create a folder called UPDATE. It MUST be called UPDATE and nothing else.
返回PSP文件夹，进入GAME文件夹，新建一个UPDATE的文件夹
8) Open up the new UPDATE folder and then copy EBOOT.PBP into this folder from your computer. Once all of this is done, you're ready to downgrade. So far, so good.
将EBOOT.PBP拷贝入UPDATE文件夹
现在应该是以下结构
root(根目录)
|
|- h.bin
|- index.dat
|
|-PSP
|
|-GAME
| |
| |-UPDATE
| |-EBOOT.PBP
|
|-PHOTO
|-overflow.tif
Double check that you followed the above instructions before continuing.
请检查上面的步骤，深呼吸，开始
Good.
9) Now, disconnect the USB connection from the computer and plug the AC adapter into the PSP. As with all upgrades, you must have a certain percentage of battery life as well as the AC adapter plugged in, or this will not work.
现在关闭USB连接，接上AC适配器，确保电池电量充足，否则将不能升级
10) Go to the Photo icon on your PSP and scroll through the pictures to get to overflow.tif. You do NOT have to press anything. It will start automatically. Two strings of letters/numbers will appear. This is normal and good.
浏览overflow.tif，你无需按任何键，它将自动运行，屏幕上将会出现两串字符/数字，这是正常现象
11) Wait AT LEAST 30 SECONDS and then turn off your PSP by holding the power button up until it fully shuts down. Then, start your PSP again.
请等待至少30秒，然后强行关机。重启
12) You will now go over to the Game icon and scroll down to memory stick. Select it and you should see the 1.5 update.
现在game菜单下应该有1.5升级的图标了
13) Select it and start it up. Go through it as you've done before with your 2.0 update and follow the prompts. When the update reaches 99% it will crash and show an error. THIS IS OKAY. DO NOT PANIC. Once again press the power switch up until it fully turns off.
运行1.5升级程序，按照指令行事，在99％时将会死机，并显示错误，这就对了，不要慌张，再强行关机一次
14) Now, turn the PSP back on. You will get another error. Just press the "O" button and it will restart after rebuilding the system data. Then just set it up as you did when you first got your PSP and you have a brand new 1.5 PSP. Be responsible with it.
现在打开PSP，将会出现错误提示，按o键，机器将会重建系统数据并重启，然后你的PSP就是1.5了
Good luck and be careful with this.
祝你好运. |
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楼主
发表于 2005-9-28 08:52 · 重庆
