How to downgrade the iPhone from IOS 5.0 to the old 4.3.3 System

Link: http://www.techolics.com

Is iOS 5 disappointing to you? Many of my friends found slow speed and high power consumption after updating iOS 5. More importantly, iOS 5 cannot be completely jailbroken, so many upgrading friends want to downgrade from IOS 5.0 (or 5.0.1) to the old mature IOS 4.3.3 version. Today, we will show you how to downgrade the iPhone, iPad, and iPod Touch systems that have been updated to iOS 5 or 5.0.1 back to the old IOS 4.3.5, 4.3.4, 4.3.3, 4.3.2, or 4.3. If everything is ready and smooth, it takes only a few minutes for the downgrade operation to return to the mature old system.

As we all know, for security reasons, Apple does not allow users to downgrade to the old system after upgrading to the new version. Naturally, there is no corresponding system degradation method or entry point. Therefore, it is risky to downgrade Ios. We recommend that you back up the data before performing this operation. If you are determined to downgrade to the old IOS system, follow these steps:

Step 1: Download the old version of IOS firmware file ipsw. You can download any system you want to downgrade to through the following link. We recommend the more mature IOS 4.3.3, which is easier to jailbreak.

All firmware downloads from Weifeng IOS: Link address

Step 2: Boot your iPhone, iPad, and iPod Touch into DFU mode. The method is to shut down the device and press and holdPower supply keyAndHome Key10 seconds.Power supply keyButton (do not open the power button when you open itHome Key, Always hold down) about 10 seconds. If you successfully enter DFU mode, the screen will be blank (the apple icon is not displayed ). However, if the device fails, shut down the device and then perform the operation several times. If the problem persists, search for relevant tutorials and videos on Baidu.

Enter DFU Mode

Step 3: To trick iTunes into accepting old ipsw firmware versions, we need to prevent iTunes from connecting to Apple's server. The method is simple. You only need to add a row to the hosts file.CodeYou can. As follows:

74.208.105.171 gs.apple.com

You should note that this is the IP address of a domain name. Where should I add this line of code? Go\ Windows \ system32 \ drivers \ etc \Folder, find a file named hosts, right-click it and choose notepad to open it. Add the code to the end and save it. For more information about how to modify the hosts, see hosts file path and modification method. If it cannot be saved after modification, see Windows 7 modify and save hosts prompt NO administrator permission solution.

Use NotePad to open the hosts file and add records

Step 4: RunITunesClick your iPhone, iPad, or iPod touch on the left side of the page. Then you can seeRestorePress and holdShiftKey, clickRestoreButton (if it is a Mac machine, you need to press and hold the keyboardALTKey ). A dialog box will pop up, locate and select the downloaded ipsw firmware file, and then clickOK. If it goes well, it will begin to drop back to iOS 4 now.

Select the iPhone device in iTunes and click "Restore ".

after the system is updated, you will see the familiar IOS 4 interface. After the downgrade is successful, if it is IOS 4.3.3, you can refer to iOS 4.3.3 super simple and perfect jailbreak method to jailbreak iPhone, iPad or iPod touch again. If any problem occurs during IOS downgrade, please leave a message in the discussion board. If you have a better solution, leave a message to share it with you.