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In the flurry of upgrades and jailbreak tools, many may have come to the realization that they are not yet ready for iOS 4 for various reasons, wether it be...
06-24-2010, 11:09 AM #1
[Guide] How To Downgrade iOS 4 : iPhone 3GS
In the flurry of upgrades and jailbreak tools, many may have come to the realization that they are not yet ready for iOS 4 for various reasons, wether it be a new bootrom, or you simply miss your Jailbroken apps from Cydia, this guide will help you downgrade your recent update to iOS 4 back to 3.1.x. While it is highly recommended to restore to 3.1.2, some of you may not have that option, but only use 3.1.3 as a last resort. However, it is important to note that if you are downgrading, in order to upgrade to iOS 4 JB, you MUST be on 3.1.2. The only jailbreak for 3.1.3 is Spirit, which is NOT compatible for upgrading to iOS 4 Jailbroken.
Before we even get started, you must have your SHSH blobs on file with Saurik's server. You can tell if you have this by opening cydia and seeing a message similar to this:
If you are 100% sure you have this message, and recall choosing the "Make My Life Easier" option when you first launched Cydia, then it's time to proceed. If you unfortunately do not have these saved, and are already on iOS 4, then there is nothing you can do.
Ok, so you made it past the hump. You have SHSH blobs on file via Saurik's Cydia server, which means your going to be able to downgrade just fine. The next question is, which firmware would you like to downgrade to. In my case, I don't have SHSH blobs on file for 3.1.2, so I will be downgrading to 3.1.3 instead.
Grab your stock firmware from the links provided at the end of this thread. Make sure you are using the one you have SHSH blobs on file for.
Now that we've got this far, its time to begin:
Note: This guide ONLY applies to the 3GS
Step 1: Modify the Hosts file
In order to trick iTunes into connecting to Saurik's server instead of Apple, we need to modify the hosts files. This applies to both Windows and Mac users. By doing this, we are able to get iTunes to think that our device is eligible for a downgrade. Normally when a new firmware is released, the older firmwares are no longer signed by Apple, thus preventing downgrading, but by connecting to Saurik's server, we bypass this issue.
1a: Modifying Windows Hosts file2: Install Firmware Manually
Browse to Windows\System32\drivers\etc\. Inside this directory you should be able to find a file named "Hosts". Open this in Notepad and add the following line to the bottom.
1b: Modifying Mac Hosts File
The same idea as windows here, only in a different location. On your Mac, Open Finder, and choose Go from the toolbar, and then Go To Folder. Type in the following: etc/ .
This folder should pop up, and inside you'll see the hosts file. Open this file with textedit and add the following line to the bottom.
Now you can launch iTunes, shift click, or ctrl click, Restore, choose your firmware, and the downgrade begins. Some of you may not have any problems from here, but some of you will end up in recovery mode by the end of it. Do not worry, this is normal. Now we just need to force the phone out of recovery mode.
3: Fix Recovery Boot Loop
In our case, I used iReb to easily fix the recovery boot method. This is of course on Windows, but you can also use many of the methods out there to fix the recovery loop. If you need further help with this, post a reply.
4: Welcome Back to 3.1.x.
Your back. Now you can patiently wait for further development on iOS 4 in the meantime and have all your fun apps back. Hope this helps everyone. I Will add photos shortly.
Resources & Links:
We have had guides for downgrading the 3GS to 3.1.2 for awhile now check em out if you need more instruction
Downgrade 3GS to 3.1.2 on a Mac
Downgrade 3GS to 3.1.2 on Windows
3.1.2 Firmware (Official Apple Links)
Download iPhone OS 3.1.2 for iPhone 2G
Download iPhone OS 3.1.2 for iPhone 3G
Download iPhone OS 3.1.2 for iPhone 3GS
3.1.3 Firmware (Official Apple Links) - Only use these if you do not have 3.1.2 on file.
Download iPhone 3.1.3 firmware for iPhone 2G
Download iPhone 3.1.3 firmware for iPhone 3G
Download iPhone 3.1.3 firmware for iPhone 3GS
iReb for Windows (Mac Soon)
iRecovery (Mac & windows)
The Following 12 Users Say Thank You to Nick Hesson For This Useful Post:
06-24-2010, 11:16 AM #2
i keep getting error 3194 on on computer, and "this device isn't eligible for the requested service" or something along those line. i have my shsh on file, and even did it again with tinyumbrella. not sure whats going on, but this sucks.
06-24-2010, 11:16 AM #3
You were just reading my mind....
06-24-2010, 11:19 AM #4
06-24-2010, 11:20 AM #5
Can someone please post a guide to jailbreaking the iphone 4 (once the tool is released)?? I need to jailbreak this beautiful bird as soon as o2 have activated my sim!
I'm stuck using wifi for the moment...not complaining, but just want a complete phone
06-24-2010, 11:23 AM #6and those of us on 3g?
Do you need the BOBS backup even if you're on an old 3G model (not 3GS?)
06-24-2010, 11:27 AM #7
You guys think I could downgrade an iPhone 4?
06-24-2010, 11:30 AM #8
06-24-2010, 11:30 AM #9
06-24-2010, 11:34 AM #10
06-24-2010, 11:36 AM #11
06-24-2010, 11:37 AM #12
on the 3gs Important thing to remember because this happened to me is you cannot just upgrade to 4.0 and jailbreak. You must first jailbreak at 3.12 with pwnage then make your custom ipsw and jailbreak to 4.0.
if you want to downgrade from 4.0 follow the tutorial it will work if you have already save your ssh with Saurik otherwise you cant go back and this only works with old boot rom.
06-24-2010, 11:39 AM #13
06-24-2010, 11:39 AM #14
I don't have a hosts file in my "etc" folder, but I have one in my "etc/distcc" folder.
Do I change that one? Or do I copy it to my "etc" folder?
06-24-2010, 11:42 AM #15
06-24-2010, 11:46 AM #16
ughh of course I would only have 3.1.3 on Sauriks server...
06-24-2010, 11:46 AM #17
Isnt the SHSH blobs was only saved for 3GS and not a requirement for the 3G?
06-24-2010, 11:46 AM #18
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I am getting (Error: 1015) after restoring from 4.0 back to 3.1.3. on a
3GS. I have the blobs on file via Saurik's Cydia server and have change the hosts files to his server as well. It goes through the whole process and fails at the very end.
I read on Saurik's page that this is normal, but I can't seem to get it to finish. The phone is now is "Recovery mode" (please connect to itunes message".
06-24-2010, 11:47 AM #19
I'm on a Mac. I can see the one in "etc/distcc" so I edited that one, plus I copied it to the "etc" folder but I still get the message from Apple that my device is not eligible.
06-24-2010, 11:50 AM #20