How to downgrade iOS 4.0 to 3.1.3 on iPhone 3GS and iPod Touch 2G,3G using Cydia SHSH

by Umair Khan Jadoon on June 23rd, 2010

ipod-touch-2g-iphone-3gs-comparison1 With the release of iOS 4 on iPhone 3GS, iPod touch 2G/3G. Apple has stopped signing 3.1.3 restore files. That means if you are using an iPhone 3GS or iPod touch 2G/3G you cannot restore any firmware other than iOS 4.0. This is because Apple won’t save your SHSH blogs on Apple’s server that are required to to downgrade to iOS 3.1.3 firmware from iOS 4. Also it is important to save SHSH blogs so that you are able to downgrade anytime from iOS 4 if Apple patches the jailbreak or unlock exploit.

Saving SHSH blobs

The tool to save SHSH blogs is TinyUmbrella. Download the version according to your OS.
-TinyUmbrella for Windows
-TinyUmbrella for Mac
Run latest version of iTunes and start TinyUmbrella.
Connect your device.
Click on “Save My SHSH” and TinyUmbrella will save the fetch the signature of SHSH blobs.
After fetching the signature, the ticket will be saved to saurik’s server (Cydia SHSH). At this time, the “Save My SHSH” button will get disabled and will get enabled again when TinyUmbrella is done with saving your blobs.

Downgrading

After saving SHSH blobs, do the following to downgrade your iOS.

If you are using Windows:
- Start notepad in Administrator privileges. To do this, right click on Notepad and click run as administrator.
- Open the hosts file from C:/Windows/System32/drivers/etc and add the following line to the bottom of the file and save it.

74.208.10.249 gs.apple.com

If you are using Mac
- Go to finder and click Go to folder. In go menu enter /etc in input field and click Go.
- Look for hosts file, right click it and open with Text Edit.
- Add the following entry to the bottom of the file.

74.208.10.249 gs.apple.com

- Click on Save As and enter the name ‘hosts’ , Where: ‘desktop’, Plain Text Encoding: ‘Westren (Mac OS Roman)’ and uncheck ‘If no extension is provided, use .txt’. Click Save.
- Drag drop file to /etc folder and follow the instructions.
Your device is now ready for downgrade by restoring. Now connect your device to Computer and turn it off.
Now you have to enter your device in DFU mode. To do this, hold power and home button together for exactly 10 seconds and then release the power button but keep holding home button until USB device is recognized.
If you see the restore logo, that means you have not entered the DFU mode. When you enter DFU mode, the following message appears on iTunes.
Click OK and restore your device to 3.1.3 firmware by holding Shift Key (Windows) or Option Key (Mac), Clicking restore and browsing the 3.1.3 firmware file.

[thanks iHackintosh, RedmondPie]

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Basurasonly

Hey after looking around and trying lots of different things I found this and it worked perfectly. Thanks!
carlos

it didn't work :"(
Makey92

man can you explain the step when you save 74.208.10.249 gs.apple.com somewhere!
JOSHO

yes i second this question...
i am not sure whether to save it exactly like printed on this website, or to add the hash like on the rest of the lines on the notepad document 'hosts'???
please help, i have spent over 5 days at home trying to work out how to fix my problem.
iPhone 3GS 4.0 downgrade to 3.1.3, so i can jailbreak.
Mywireless2010

this need to be better detail about saving the file i have try 5 times and it all failed with error code 3194.
please help...i have a 3gs with 4.0 and can't be jailbroken. "New Boot Rom"
thanks
Carlos

dude my host files are now all messed up! and i still get error 3194, also my wifi and blue-tooth were grayed out and my sound is coming from both my speaker and my headphones! please i need to fix my ipod touch 8g 2g!
Aeshverma

i am getting error 3194 on ipod touch 3g and itunes 9.2
Pingback: How to jailbreak iPhone 3G, 3GS and iPod Touch 2G on iOS 4 using sn0wbreeze 1.6.1 | MerryCode
Wlk3r

Let me get this right, you expected us to save our SHSH blogs before we updated to iOS4?? Or does it matter if we save it before or after??
Jj

save the file to desktop you are good to go then
worked fine you saved my life ..
Cml Ar

amciklar türce yazinda anliyak
jadoon88

You don't need to put the hash before. Do it as it is mentioned
Smoothiewars

it still says that my firmware is not eligible for this build. i'm using the ipod touch 3g 32gb.
Smoothiewars

Okay I redid stuff and I checked TinyUmbrella. When I press save my shsh and i choose the ipod touch 3g 3.1.3, it 'processes the request' then it says that the device isn't eligible. was i supposed to save the shsh before i upgraded to 4.0??! because if so, thats pretty hopeless. any help?
Smoothiewars

i have this question too. is your problem the same as mine? i'm smoothiewars up at the top.
G_man2456

hey what did u do to get it working
Pingback: How to save SHSH blobs (ECID SHSH) of iPhone 4 running iOS 4 | MerryCode
jadoon88

You need to save SHSH blobs if you wish to downgrade your iOS.
AgentPurple

Everyone who has a 3gs and has their shsh stored and everything is working correctly and you get the 1015 error use recboot and it still doesnt work; try downgrading your itunes to version 9 instead of 9.2 Just be careful to backup your libraries and all that, or do it on a different machine then re-sync on your normal machine.

As soon as I switched to the older itunes version everything worked as posted.
Millz

yah... i did this and it went into restore mode, and automatically restored itself tback to 4.0... i did everything it said in this guide correctly, and it still came back because apple doesnt want you to downgrade i dont belive... please email me and tell me how i can fix this. millzwazhere@gmail.com
Vijay

Hi, Maybe I am not getting this right.. Someone Please answer this

Should we have saved the SHSH Blobs BEFORE UPGRADING TO 4.0 or CAN WE STILL SAVE IT WHILE IN 4.0, then downgrade.??

Pls...........
Vijay

Hi Jadoon88, should we save the SHSH Blobs before upgrading to 4.0 (while in 3.1.3) or is it ok even if we do it after we are in 4.0?
jadoon88

You should save SHSH blobs before upgrading to iOS 4.0 (while on 3.1.3)
Jonejoe

great guide but it was a little hard to follow without pictures.

i found another guide without pics: http://ipodtoucher55.blogspot.com/2010/07/downg...
Jonejoe

sry ment, with pics
Carlie

Just wanted to say thanks for this, I couldn't figure it out by myself.
Johnwu558

u have to move to copy the hosts file then delete to recycle bin.
after that create a notepad file copy paste the apple thing.
then save the file into the windows/system32/drivers/etc but name the file the file u deleted in the recycle bin
http://tvgamedepot.com Chuck Soldano

Just saying thanks will not just be sufficient, for the tremendous lucidity in your writing. I will right away grab your rss feed to stay abreast of any updates.
http://www.wh-tech.com IP Camera

Hey, wonderful blog you have here! Keep up the excellent work
Tinovjr

where do i find 3.1.3 firmware?
http://nfl.com Jason

when i goto C:/Windows/System32/drivers/etc i dont see any host files...what do i do?
http://www.rightlog.com sam

Is there a chance to jailbreak iphone 4
http://www.facebook.com/profile.php?id=100001780418227 Jose Javier Flores

what if my ipod came with ios4.0, and it is very slow on 4.0-4.2.1
Ayushsood

hey dude u must enter well detailed downgrading
Ll

I run the TinyUmbrella and get the following message:What does it mean?

Exception in thread "AWT-EventQueue-0" java.lang.NoClassDefFoundError: com/sun/jna/Platform at com.semaphore.os.UIHandlerManager.getSystemUIHandler(UIHandlerManager.java:22) at com.semaphore.TinyUmbrella.(TinyUmbrella.java:131) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Unknown Source) at com.semaphore.TinyLoader.loadTiny(TinyLoader.java:245) at com.semaphore.TinyLoader.access$000(TinyLoader.java:27) at com.semaphore.TinyLoader$1.run(TinyLoader.java:40) at java.awt.event.InvocationEvent.dispatch(Unknown Source) at java.awt.EventQueue.dispatchEventImpl(Unknown Source) at java.awt.EventQueue.access$000(Unknown Source) at java.awt.EventQueue$1.run(Unknown Source) at java.awt.EventQueue$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source) at java.awt.EventQueue.dispatchEvent(Unknown Source) at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.run(Unknown Source)Caused by: java.lang.ClassNotFoundException: com.sun.jna.Platform at java.net.URLClassLoader$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) ... 21 more
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[thanks iHackintosh, RedmondPie]

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