請注意：此2.5/2.6 降級程式是有風險的！我們不擔保一切成功與失敗的後果！

原文：
Yes, you have read the title right - 2.50/2.60 Downgrader. Dark_Alex , along with Mathieulh and Yoshihiro from SonyXTeam, have released the first working 2.50/2.60 downgrader. Most credit goes to Dark_Alex (as said by Mathieulh) as he is the founder of the downgraderWe have seen several betas over the past few days, several of which have been confirmed as non-working. However, just a few moments ago, Mathieulh released a beta version of the upcoming v5 of the downgrader. Dark_Alex is current asleep as I am typing this, and thus can not release the final version (non-beta). If you choose to use this downgrader, use it at your own risk!! This is still a beta version!! A lot of people are reporting success, but please, try at your own risk!

The IRC (Internet Relay Chat) is full of discussion over this downgrader and we are right there, getting every bit of information for you. Now, you are probably wondering how the downgrader works after the previous attempts failed. Mathieulh says it best in the release thread - "It uses some sony libraries found in the 1.50 updater to perform the most critical steps, the logical format of the flash, and the ipl writing. See technical details for more info about how it works." The technical details can be found in the release thread.

Now, you are all wondering - "Well, how the "hell" do I use this?" Here's your answer-

The downgrade process is separated between two people, a 1.50 user and you (2.50/2.60 user). The 1.50 user must own a 1.50 firmware PSP and will have to follow simple steps to obtain some files for you. The instructions are as follow -

Before downgrading, make sure you meet the following requirements -
Your PSP is not a TA-082 (If you do have this PSP version, it may result in a brick)
You do not have a factory 2.5/2.60 PSP (DG only works on updated PSP's)

1.50 User Instructions

Copy the folders downhelper and downhelper% from the folder 1.50 HELPER folder to /PSP/GAME/ in your memstick.
Obtain the 1.50 update and put it in /PSP/GAME/UPDATE in your memstick. You may find the 1.50 update in our download site here.
Init the downhelper program.
It will dump your flash and some files from the updater eboot to the memstick. (These files are illegal under US copyright laws, so please do not distribute them in the comments or on our forums)
After that, the program will exit. You can now delete the updater from /PSP/GAME/UPDATE
You'll notice that you have a new folder in the root of your memstick called "DOWNDATER".
That's the folder you'll have to send to a 2.50/2.60 to let him test the downgrade.

2.50/2.60 User Instructions


Copy the folder the DOWNGRADER/2.50/DOWNDATERTEST if you have 2.50
or DOWNGRADER/2.60/DOWNDATERTEST if you have 2.60 to /PSP/GAME/ in your memstick
Wait for someone with 1.50 to pass you a folder called DOWNDATER and copy it to the root of your memstick.
Init GTA and the eLoader
In the eLoader menu, choose the downdater test. WARNING: the program won't output any display and any warnings, it will init the downgrader process inmediatelly.
You'll see the your memstick flashing. That means that your psp is being flashed from the memstick.
You won't see any type of output in the screen (this is for safety). When the memstick finishes of flashing, WAIT at least a minute, and then reinit your psp by holding the power button.
That's all. If all went right, you'll have 1.50. If it went less good, you'll still have 2.50/2.60. If all went wrong, you'll have a bricked psp(except in the case you have the modchip) Remember that you have accepted that risk.


降級程式教程：
1.5主機方面：
      1。將1.5helper文件夾裡面的 downhelper 和 downhelper%文件夾拷到/PSP/GAME/ 裡面
      2。將1.5升級程式放到/PSP/GAME/UPDATE 裡面。
      3。在1。5psp啟動downhelper程式
      4。正個程式會將1.5升級程式的flash同一些檔dump到你的記憶棒中（在美國版權中傳播這個是非法的，所以自己dump)
      5。之後，程式會自動退出，這時自己將/PSP/GAME/UPDATE裡面的updater檔刪除。
      6。你會發覺有個叫做downdater新文件夾出現在記憶綁裡。
       7。這個就是要傳去2.5/2.6測試降級的文件夾。


2.5與2.6主機方面：
     1。將DOWNGRADER/2.50/DOWNDATERTEST（2。5）或DOWNGRADER/2.60/DOWNDATERTEST（2。6）拷到 /PSP/GAME/ 裡面
    2。讓那個進行了1。5操作的那個人將downdater檔夾傳到你的2.5/2.6的根目錄下。
    3。打開gta 和eloader.
    4.在eloader menu（菜單）中，選擇downgrader text（切記，選擇後沒有任何提示的，開始了就不能回頭了）
    5。這時你會看到psp的記憶棒的燈一直亮，說明正在從記憶棒讀取flash的數據。
     6。你不會看到螢幕上出現任何東西（是安全的，不要自己以為死機去關機。。。）。當 你的燈停止閃爍以後，"至少保持"1分鐘，再重啟psp，(重啟就是按住幾秒的重啟-_-!)
     7.講完了,如無意外,你已經是1.5了,如果有小小差錯,你還是2.5/2.6,如果完全弄錯,你就是磚頭的擁有者了除非你有modchip晶片還有救...
 

這個賭注太大了~~我的小P要是掛了~~我會哭死~!

成功率有多少呢!?希望有90%ㄆㄆ~~~

不會很難,下午我試過了,幾分鐘不到就好了.

只是一開始會出現起始畫面,因為裡面放的是

gta ,還會叫你設定上網,索性強迫重開機,把記憶

卡拿出,放原本用在另一台1.5的2g記憶卡,重開機

後完全和1.5版一樣使用,連2.6自設桌面都不見了

好像新機一樣!有空補圖!

真的嗎???

7樓大大有勞您做個教學造福大家好嗎!!感激不盡

要是多幾個像各大大一樣分享的人,那台灣的網站就強囉!!

下面是操作的轉貼,因為7-10步驟就是我所形容的,

差點以為有問題.

至於程式我覺得根本可以打包成傻瓜包,

直接拷備到已格式化原廠所附32m的卡,

再來就是執行GTA遊戲光碟後會進入

emenu,再按圈圈就等三分多鐘後出現一大

堆不同語言文字的起初畫面,強迫重

開機後,開機前把光碟和卡拿出.看看

版本就是1.5版.出人意外的簡單,奇

摩拍賣有人用這招每台收300元!真狠!

轉貼從黑皮討論區:

若您的主機原本是1.5的，不小心升級過頭現在可以降級了。


注意：
- 主板編號為TA-082的PSP不能使用這個程序，只有由低版本升到2.5/2.6的PSP可以，換句話，說出廠時版本就已經為2.5或者2.6的機器不能降級。並且，升級到2.61乃至更高版本的也不可以。
- 成功與否本人將不會負責…
- 降級前請確保有80%以上的電

需要：
- GTA UMD (2.00版本)一隻

降級方法：

1. 下載傻瓜包 (eLoader 0.95 + 降級程式)
- 2.50 版本
- 2.60 版本

2. 插上充電器


3. 放入 GTA UMD (需要2.00版本的GTA UMD , 2.60版本的GTA UMD目前是不能降級)


4. GTA Loading 畫面


5. 載入eLoader


6. 選擇"Downdate Test"



7. 若果運行成功，你的MSD便會閃動 (代表正在Flash)，等待三~四分鐘


8. 完成後重新開機，會發現無法Load UMD


9. 這個時候請重新開機 (將Power掣向上推5秒 ,完全關機)

10. 這時你應該能夠Load UMD，再檢查你的版本…便會發現己經是1.50版本！

謝謝大大的分享

本來我是１．５版的

怎知看到網路上有新的版本就給它昇級了２．５

現在什麼都不能玩了．．

真可恨

現在可以降回去,不過你須要有gta遊戲片

這是昨天降級前的照片

[attach]3489[/attach]

降級到1.5的照片
[attach]3490[/attach]

降級後資料全變新的,連名稱也是,

但注意TA-082的不能降級,就是打開UMD

看裡面右上角機板有沒有IC1003的字,

沒有的就可以,有的就是TA-082,不能降

danielhung大大

感謝您的分享!!!

抱歉 我是新手 請多包含 想請問 這個程式 能夠把2.0降成1.5嗎

因為我人在紐約 不在台灣 這邊買到的psp都是2.0 如果這個不行 請問在哪可以找到

2.0降成1.5的程式  爬過文 都找不到  thanks

請先查明您的psp不能是1007k的2.0版本

http://wen-jos.idv.tw/psp%20update/index1.htm

http://wen-jos.idv.tw/psp%20update/index.htm

本站首頁上很早前就有資料囉!!

請您參考上方二網教學吧!!

大哥這是真的嗎我的2.60有救了耶

想當初為了玩機戰不小心昇到2.60之後

就一直在等這個降級說

大哥我下載了啊但裡面沒有你說的downhelper 和 downhelper%文件夾耶

只有1[1][1].50 HELPER這個那要怎麼用啊

請參考另一帖子點我

看了大家都降級拉

可是我還是很懷疑的說

就是他降到1.5版之後

可以玩ISO的遊戲媽

如果可以我的小P就有救拉!!

看一看  參考

一定要GTA遊戲光碟嗎???別ㄉ遊戲光碟2.0不行ㄇ???

 IC6001ㄉㄎ以ㄇ???

khbhgkh

好帖子

讓我來

VERY GOOD

thanx

我降降看

希望小p不會爆掉

1007K也能降ㄇ

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