Downgrade iPhone 4.1 to iOS 4.x - GSM-Forum

rafiqcell · 09-12-2010, 10:27

Sometimes you may have some problems or discomfort with your iPhone 3G/3GS or 4 iOS 4.1 [COLOR=#E95400 ! important][COLOR=#E95400 ! important]firmware[/COLOR][/COLOR] and you may wish to downgrade your

[COLOR=#E95400 ! important][COLOR=#E95400 ! important]device[/COLOR][/COLOR] to iOS 4.0.2, 4.0.1, 4, 3.1.3 or lower. Here are the instructions to downgrade iPhone 4.1 to iOS 4/4.0.1/4.0.2 or 3.x.x firmware.
NOTE : This guide is only for those who have saved SHSH to the Cydia Server.
1. Download the firmware [COLOR=#E95400 ! important][COLOR=#E95400 ! important]file[/COLOR][/COLOR] to which you want to downgrade your iPhone to, that is, if you want to downgrade iPhone 4.1 to iOS 4, then download iOS 4 firmware.
2. The second step is to edit the Hosts file.
In [COLOR=#E95400 ! important][COLOR=#E95400 ! important]Windows[/COLOR][/COLOR]
• Open [COLOR=#E95400 ! important][COLOR=#E95400 ! important]Notepad[/COLOR][/COLOR] with administrator privileges. Right click in its icon and choose ” Open as Administrator “.
• Navigate to C:/Windows/System32/drivers/etc in Notepad and open the Hosts file.
• Add ” 74.208.10.249 gs.apple.com ” at the end of the file and save the file.
In [COLOR=#E95400 ! important][COLOR=#E95400 ! important]Mac [COLOR=#E95400 ! important]OS [/COLOR][COLOR=#E95400 ! important]X[/COLOR][/COLOR][/COLOR]
• Navigate to Go->Go to Folder and enter ” /etc “.
• Using TextEdit, open up the Hosts file.
• Add ” 74.208.10.249 gs.apple.com ” at the and of the document, choose Save As, uncheck ” If no extension is provide, use .txt ” and save the file on the desktop.
• Replace the original Hosts file with the new one.
3. Now connect your iPhone to the [COLOR=#E95400 ! important][COLOR=#E95400 ! important]computer[/COLOR][/COLOR].
4. Select your device in [COLOR=#E95400 ! important][COLOR=#E95400 ! important]iTunes[/COLOR][/COLOR].
5. Now enter into [COLOR=#E95400 ! important][COLOR=#E95400 ! important]recovery[/COLOR][/COLOR] mode by pressing the power and home buttons for 10 seconds and then release the power button but keep holding the home button until iTunes recognize your device in recovery mode.
6. Now hold the Shift Key in Windows or the Option Key in Mac OS X and click on the Restore button.
7. Browse to the required iOS 4 or 4.0.1 or 4.0.2 or 3.1.3 firmware file and select it to downgrade your iPhone to that.
8. Now exit recovery mode ( For this, you could use a software called ” Recboot ”) and reboot your iPhone.
That’s it! Now your iPhone 3G/3GS/4 will be downgraded to the required firmware.

tn_royal · 09-12-2010, 15:58

i have problem i buy i phone from someone they update to ios 4.1 and modem firware 05.14.02. therefore, i read the unlock iphone 3g ios 4.1 with redsnow. so my phone have white cydia , it is lock ; it can not do anything. I donot save shsh. Also, i download iphone1,2_8A293 restore; i do not understand open with administrator privileges ( how )Right click in its icon and choose ” Open as Administrator “.
• Navigate to C:/Windows/System32/drivers/etc in Notepad and open the Hosts file.
so help me to unlock 3g 4.1

09-12-2010, 10:27	#1 (permalink)
rafiqcell Freak Poster Join Date: Feb 2009 Location: Research In Motion Age: 38 Posts: 479 Member: 979016 Status: Offline Sonork: 1592061 Thanks Meter: 150	Downgrade iPhone 4.1 to iOS 4.x Sometimes you may have some problems or discomfort with your iPhone 3G/3GS or 4 iOS 4.1 [COLOR=#E95400 ! important][COLOR=#E95400 ! important]firmware[/COLOR][/COLOR] and you may wish to downgrade your [COLOR=#E95400 ! important][COLOR=#E95400 ! important]device[/COLOR][/COLOR] to iOS 4.0.2, 4.0.1, 4, 3.1.3 or lower. Here are the instructions to downgrade iPhone 4.1 to iOS 4/4.0.1/4.0.2 or 3.x.x firmware. NOTE : This guide is only for those who have saved SHSH to the Cydia Server. 1. Download the firmware [COLOR=#E95400 ! important][COLOR=#E95400 ! important]file[/COLOR][/COLOR] to which you want to downgrade your iPhone to, that is, if you want to downgrade iPhone 4.1 to iOS 4, then download iOS 4 firmware. 2. The second step is to edit the Hosts file. In [COLOR=#E95400 ! important][COLOR=#E95400 ! important]Windows[/COLOR][/COLOR] • Open [COLOR=#E95400 ! important][COLOR=#E95400 ! important]Notepad[/COLOR][/COLOR] with administrator privileges. Right click in its icon and choose ” Open as Administrator “. • Navigate to C:/Windows/System32/drivers/etc in Notepad and open the Hosts file. • Add ” 74.208.10.249 gs.apple.com ” at the end of the file and save the file. In [COLOR=#E95400 ! important][COLOR=#E95400 ! important]Mac [COLOR=#E95400 ! important]OS [/COLOR][COLOR=#E95400 ! important]X[/COLOR][/COLOR][/COLOR] • Navigate to Go->Go to Folder and enter ” /etc “. • Using TextEdit, open up the Hosts file. • Add ” 74.208.10.249 gs.apple.com ” at the and of the document, choose Save As, uncheck ” If no extension is provide, use .txt ” and save the file on the desktop. • Replace the original Hosts file with the new one. 3. Now connect your iPhone to the [COLOR=#E95400 ! important][COLOR=#E95400 ! important]computer[/COLOR][/COLOR]. 4. Select your device in [COLOR=#E95400 ! important][COLOR=#E95400 ! important]iTunes[/COLOR][/COLOR]. 5. Now enter into [COLOR=#E95400 ! important][COLOR=#E95400 ! important]recovery[/COLOR][/COLOR] mode by pressing the power and home buttons for 10 seconds and then release the power button but keep holding the home button until iTunes recognize your device in recovery mode. 6. Now hold the Shift Key in Windows or the Option Key in Mac OS X and click on the Restore button. 7. Browse to the required iOS 4 or 4.0.1 or 4.0.2 or 3.1.3 firmware file and select it to downgrade your iPhone to that. 8. Now exit recovery mode ( For this, you could use a software called ” Recboot ”) and reboot your iPhone. That’s it! Now your iPhone 3G/3GS/4 will be downgraded to the required firmware.

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09-12-2010, 15:58	#2 (permalink)
tn_royal Junior Member Join Date: Sep 2010 Posts: 8 Member: 1392033 Status: Offline Thanks Meter: 0	i have problem i buy i phone from someone they update to ios 4.1 and modem firware 05.14.02. therefore, i read the unlock iphone 3g ios 4.1 with redsnow. so my phone have white cydia , it is lock ; it can not do anything. I donot save shsh. Also, i download iphone1,2_8A293 restore; i do not understand open with administrator privileges ( how )Right click in its icon and choose ” Open as Administrator “. • Navigate to C:/Windows/System32/drivers/etc in Notepad and open the Hosts file. so help me to unlock 3g 4.1