How To Downgrade Firmware 4.0.2 to 4.0.1 without your SHSH saved
A user named CodeBlue has discovered an unconfirmed method that may allow you to downgrade your 4.0.2 iPhone to 4.0.1, jailbreak, patch the safari exploit with Saurik’s patch and be jailbroken safely. This may be your only option if you have an out of the box iPhone with 4.0.2 on it and no other way to jailbreak. Note that I did not try these steps. They sound good to me in theory and others are reporting some success. After all, you have nothing to lose if you are already stuck on 4.0.2 without an SHSH in Cydia.
Here are the steps :
1. Download 4.0.1 ipsw
2. Extract it with winrar or winzip to a folder on the desktop. You may need to rename the firmware file from .ipsw to .zip to do this.
3. Open the buildmanifest.plist with the notepad. Search and replace all – 8A306 with 8A400. Save. Repeat the same with the file restore.plist
4. Download 4.0.2 ipsw and open this with winrar or winzip.
Note : Do not extract it. Just open it and leave it open. You must use this exact file and not create a new one. If you have to create a new one for reasons like you are on OSX, then use zip command line not explorer or finder to make the zip. I will assume you are using the original file opened in winrar for the rest of this guide.
5. Take all the files from the 4.0.1 and drag them over to the 4.0.2 zip archive that you have open.
6. Delete all the dmg files that have 002 at the end, leaving only the 001 files left.
7. Save the archive. And rename it back to .ipsw if you changed the name to get winrar/winzip to open it.
8. Optional: (this helps ensure you get an shsh file request for the future, but should not be necessary to just restore 4.0.1). Add the 74.208.10.249 gs.apple.com line to the host file. If you need help with this step, read this.
9. Put the device into dfu, open iTunes and restore the firmware you changed.
Note : this only works due to the similarities in 4.0.2 to 4.0.1 and 4.0. This will not be a way to downgrade to 3.1.x and may not work in future firmware updates.
一個用戶名為CodeBlue已經發現了一個 未經證實的 方法，可以讓你降級的4.0.2 iPhone 到4.0.1， 越獄，修補與Saurik的Safari漏洞的補丁，並越獄安全。 這可能是你唯一的選擇，如果你有一個現成的 iPhone 4.0.2與它並沒有其他辦法可以 越獄. Note that I did not try these steps. They sound good to me in theory and others are reporting some success. After all, you have nothing to lose if you are already stuck on 4.0.2 without an SHSH in Cydia.
下面是步驟：
1。 下載 4.0.1固件ipsw
2. Extract it with winrar or winzip to a folder on the desktop. You may need to rename the 固件 file from .ipsw to .zip to do this.
3. Open the buildmanifest.plist with the notepad. Search and replace all – 8A306 with 8A400. Save. Repeat the same with the file restore.plist
4。下載 4.0.2固件ipsw 並打開此用winrar或winzip。
注意： 不要解壓。 只要打開它，給它打開。 你必須使用這個確切的文件，而不是創建一個新的。 如果您要創建一個新的原因，你是在OSX上，然後用zip命令行不Explorer或Finder中，使拉鍊。 我將假定您使用的是原始文件在WinRAR打開了本指南的其餘部分。
5. Take all the files from the 4.0.1 and drag them over to the 4.0.2 zip archive that you have open.
6. Delete all the dmg files that have 002 at the end, leaving only the 001 files left.
7。 保存該檔案。 並將其重命名回。固件ipsw如果你改變了名字得到WinRAR的/ WinZip來打開它。
8。 可選：（這有助於確保您收到shsh文件要求的未來，但應該沒有必要只是恢復4.0.1）。 添加74.208.10.249 gs.apple.com線到主機文件。 如果您需要幫助，這一步，看 這個。
9。 把 設備進入DFU，打開iTunes，恢復 固件 你改變。
注： 這僅適用於由於相似之處4.0.2到4.0.1和4.0。 這將不是一種方法降級到3.1.x，可能無法工作在未來的固件更新。
A user named CodeBlue has discovered an unconfirmed method that may allow you to downgrade your 4.0.2 iPhone to 4.0.1, jailbreak, patch the safari exploit with Saurik’s patch and be jailbroken safely. This may be your only option if you have an out of the box iPhone with 4.0.2 on it and no other way to jailbreak. Note that I did not try these steps. They sound good to me in theory and others are reporting some success. After all, you have nothing to lose if you are already stuck on 4.0.2 without an SHSH in Cydia.
Here are the steps :
1. Download 4.0.1 ipsw
2. Extract it with winrar or winzip to a folder on the desktop. You may need to rename the firmware file from .ipsw to .zip to do this.
3. Open the buildmanifest.plist with the notepad. Search and replace all – 8A306 with 8A400. Save. Repeat the same with the file restore.plist
4. Download 4.0.2 ipsw and open this with winrar or winzip.
Note : Do not extract it. Just open it and leave it open. You must use this exact file and not create a new one. If you have to create a new one for reasons like you are on OSX, then use zip command line not explorer or finder to make the zip. I will assume you are using the original file opened in winrar for the rest of this guide.
5. Take all the files from the 4.0.1 and drag them over to the 4.0.2 zip archive that you have open.
6. Delete all the dmg files that have 002 at the end, leaving only the 001 files left.
7. Save the archive. And rename it back to .ipsw if you changed the name to get winrar/winzip to open it.
8. Optional: (this helps ensure you get an shsh file request for the future, but should not be necessary to just restore 4.0.1). Add the 74.208.10.249 gs.apple.com line to the host file. If you need help with this step, read this.
9. Put the device into dfu, open iTunes and restore the firmware you changed.
Note : this only works due to the similarities in 4.0.2 to 4.0.1 and 4.0. This will not be a way to downgrade to 3.1.x and may not work in future firmware updates.
一個用戶名為CodeBlue已經發現了一個 未經證實的 方法，可以讓你降級的4.0.2 iPhone 到4.0.1， 越獄，修補與Saurik的Safari漏洞的補丁，並越獄安全。 這可能是你唯一的選擇，如果你有一個現成的 iPhone 4.0.2與它並沒有其他辦法可以 越獄. Note that I did not try these steps. They sound good to me in theory and others are reporting some success. After all, you have nothing to lose if you are already stuck on 4.0.2 without an SHSH in Cydia.
下面是步驟：
1。 下載 4.0.1固件ipsw
2. Extract it with winrar or winzip to a folder on the desktop. You may need to rename the 固件 file from .ipsw to .zip to do this.
3. Open the buildmanifest.plist with the notepad. Search and replace all – 8A306 with 8A400. Save. Repeat the same with the file restore.plist
4。下載 4.0.2固件ipsw 並打開此用winrar或winzip。
注意： 不要解壓。 只要打開它，給它打開。 你必須使用這個確切的文件，而不是創建一個新的。 如果您要創建一個新的原因，你是在OSX上，然後用zip命令行不Explorer或Finder中，使拉鍊。 我將假定您使用的是原始文件在WinRAR打開了本指南的其餘部分。
5. Take all the files from the 4.0.1 and drag them over to the 4.0.2 zip archive that you have open.
6. Delete all the dmg files that have 002 at the end, leaving only the 001 files left.
7。 保存該檔案。 並將其重命名回。固件ipsw如果你改變了名字得到WinRAR的/ WinZip來打開它。
8。 可選：（這有助於確保您收到shsh文件要求的未來，但應該沒有必要只是恢復4.0.1）。 添加74.208.10.249 gs.apple.com線到主機文件。 如果您需要幫助，這一步，看 這個。
9。 把 設備進入DFU，打開iTunes，恢復 固件 你改變。
注： 這僅適用於由於相似之處4.0.2到4.0.1和4.0。 這將不是一種方法降級到3.1.x，可能無法工作在未來的固件更新。
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