【ZT】
今天已上网就看到了这个激动人心的时刻，本人的是欧版1.52的psp，为了这一刻等了好久了，眼泪。。。。?
好了，我来说说我的降级过程，以供大家参考，完善
首先，如果自己的psp是1.51或者1.52，请升级到2.0
在
http://pspupdates.qj.net/上找到了相关的说明，上面的英文简单明了，我会为大家翻译 破解文件下载：
http://pspupdates.qj.net/MPHDowngrader.zip/ 1.50升级文件：[url]http://files.pspupdates.qj.net/cgi-bin/cfiles.cgi?0,0,0,0,40,1410[url]
-在psp根目录下建立一个update的文件架?
-在网上下1.50 的升级程序，eboot.pbp,拷贝到/PSP/GAME/UPDATE 文件夹下
-解压mphdowngrader.zip
-拷贝overflow.tif文件到psp/PHOTO/目录下（他上面说要改背景图片frame_buffer.png,我个人觉得没关系的，我就没改，一样成功）
-拷贝h.bin文件到psp根目录下
-拷贝index.dat到psp根目录下
记住，电池要满的哦，同时插上直流电源
好了，就如接下来他介绍的那样，接下来的步骤比较重要，首先打开psp，进入图片浏览一项，你会突然发现psp黑屏了，恐怖。。。不过，没关系，等上30秒，这个程序会建立一些必要的文件在根目录下，你这时候重启动psp就行了（一直按住power）
最后了，知道了吧，进入小pgame目录，找到那个1.50的升级程序吧，升级了。。。。。。正在激动在99%的时候，突然说出错了。。。。狂汗。。。。，接下来的事情更恐怖，重启动的小p居然蓝屏，是不是盖茨支招了？再次放心一下，我们再重启动小p一下，哇哈哈，安全。没关系，chinagba.com - ?梃 蒴(t>
行了，到了这一步，恭喜，已经是我们望眼欲穿的1.50了，。。。眼泪。。。
Although this has been tried and found working, this does not mean there is no risk involved so use at your own risk.
Steps to use the MPH downgrader:
- Create an UPDATE folder in the /PSP/GAME/ folder of your memory stick
- Copy EBOOT.PBP (update 1.50) in /PSP/GAME/UPDATE folder
- Unpack MPHDowngrader.zip
- Copy overflow.tif in your PSP/PHOTO/ folder of your memory stick
(make sure you have changed your background to frame_buffer.png as explained in the toc2rta exploit.)
- Copy h.bin in root of your memory stick
- Copy index.dat in root of your memory stick
- Plug the AC adaptor
What you do next is go into the Photo Menu on the PSP and it will show some jumbled text, which is normal. Wait about 30 seconds and then restart your PSP.
From there you will now have a new file in your PSP’s root directory called ms0:/index.dat.bak. In the next step you will go to you Game Menu, Then Memory Stick, and then Launch “PSP Update ver 1.50.”
It will then ask you to downgrade and lead you along to installing. Here is where I got scared. It installed to 99% then errored. This is OK. Restart your PSP and reboot it. It will come up with another error which is OK as well. Restart it again and you will have PSP firmware version 1.50. Enjoy, and welcome to the world of legal homebrew, not piracy.
[img]http://www.cngba.com/1117038101/Mon_0509/122_108229.jpg[/img]
