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...
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發表於 2006-7-1 18:13
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