Dev Team Working on Baseband Downgrade for Easier iPhone Unlock

By Sebastien Page on Dec 8, 2010

Those of you who recently unlocked their iPhones running iOS 4.2.1 or 4.1 know that the process wasn’t as straightforward as we expected. The latest UltraSn0w unlock works for the iPhone 3G or iPhone 3GS with baseband 04.26.08, 05.11.07, 05.12.01, or 05.13.04. It also works with iPhone 4 with baseband 01.59.00. But if you’re iPhone is on a different baseband, you have to upgrade to 06.15.00, either using RedSn0w or PwnageTool.

This new unlock doesn’t come without its share of issues, with battery drain for some of us, and/or GPS issues for others. Fortunately, it seems the Dev Team is working on a baseband downgrade method, which would make the unlock process easier, and safer… Read More

 

How to Downgrade iPhone iOS 4.2.1

By Sebastien Page on Dec 2, 2010

Let’s say you recently updated your iPhone to iOS 4.2.1 and for various possible reasons, you are already regretting this move. It is possible to downgrade your iPhone 4.2.1 to a previous iOS, but for this, you need to have your SHSH blobs on file for the iOS you want to downgrade to.

To be completely clear, if you don’t have your SHSH blobs on file for the iOS you want to downgrade to, you will not be able to downgrade. There is no way around that. This being said, here is how to downgrade iPhone iOS 4.2.1 to  4.1, 4.0.2, 4.0.1, or 4.0… Read More

 

How to Downgrade iPad 3.2.2

By Sebastien Page on Sep 21, 2010

This step by step guide and tutorial will show you how to downgrade your iPad iOS 3.2.2 to a previous iOS version. In order to downgrade your iPad from 3.2.2 to 3.2.1, you will have to have your SHSH blobs on file on Saurik’s servers. If you do not have these SHSH blobs on file, you will not be able to downgrade.

Downgrading iPad iOS 3.2.2  Read More

 

How to Downgrade iPhone iOS 4.1

By Sebastien Page on Sep 8, 2010

iOS 4.1 is now available for download, and I’m pretty sure some of you will “accidentally” update to 4.1 and will want to downgrade back to iOS 4.0.1, which is the latest jailbreakable and unlockable iOS (at least at the time I’m writing this).

This simple guide and tutorial will show you how to downgrade your iPhone iOS 4.1 to iOS 4.0.2, or 4.0.1, or iOS 4, or any earlier version. The steps are the same no matter what iOS you want to downgrade to. Read More

 

How to Downgrade Your iPhone 4.0.2 to 4.0.1 Without SHSH Blobs on File

By Sebastien Page on Aug 30, 2010

We’ve already gone over methods for downgrading an iPhone from iOS 4.0.2 to 4.0.1. Unfortunately, this method requires you to have your SHSH blobs on file on Saurik’s server, which some of you don’t have.

There is a post today on the Big Boss blog about how to downgrade from 4.0.2 to 4.0.1 without SHSH blobs, so I thought it might be helful to some of you. Read More

 

How to Downgrade iPhone 4.0.2 to 4.0.1

By Sebastien Page on Aug 16, 2010

This step by step guide will show you how to downgrade your iPhone iOS 4.0.2 to iOS 4.0.1. These steps are pretty simple but there is one major requirement: you must have your SHSH files saved on Saurik’s server. There is absolutely no way around it. If you don’t have your SHSH, you won’t be able to downgrade your iPhone.

In this tutorial, we will see how to downgrade the iPhone from 4.0.2 to 4.0.1 but the steps are the same if you want to downgrade to iOS 4 or even 3.1.3.

There are several methods used to downgrade the iPhone. We will learn the method that uses TinyUmbrella. No file editing will be necessary.

How to Downgrade from iOS 4.0.2 to 4.0.1

Step 1: Let’s download your SHSH blobs from Saurik’s server to your computer. To do so, download TinyUmbrella and plug your iPhone in. Select the “Advanced Options” box. Also select the firmware version to which you wish to downgrade. Finally, select “Cydia” under “Request From”. Then hit “Save My SHSH”. This will grab your SHSH files from Saurik’s servers and save them on your computer.

Step 2: Download the firmware to which you wish to downgrade to from our iPhone downloads section. Save it to your desktop.

Step 3: Put your iPhone in DFU Mode. To do so, launch iTunes and plug your iPhone in. Press and hold the Home and Power button together for 10 seconds. After 10 seconds, release the Power button while still holding the Home button until iTunes pops up and says it has found an iPhone in recovery Mode.

Step 4: Run TinyUmbrellaand click the “Display SHSHs” button to make sure your SHSH blobs were downloaded to your computer. Once done, click “Start TSS Server”.

Step 5: Now we’re going to restore to the firmware you want. To do so, launch iTunes and plug your iPhone in. Hold to SHIFT key (Windows only) or ALT/Option key (Mac only) while clicking on Restore. Make sure you hold the key while clicking Restore. A window will open. Simply select the firmware you downloaded in step 2.

Step 6: Your iPhone will start the restore process. You will most likely get several errors (error 1011, 1013, and 1015) but that’s ok, don’t worry about those.

Step 7: Finally, we need to get your iPhone out of recovery mode. To do so, simply click “Kick Device Out of Recovery” in TinyUmbrella.

Done!

You should now be back on a previous iOS, giving you the ability to jailbreak and unlock.

 

How to Downgrade Your iPhone From iOS 4 to 3.1.3

By Sebastien Page on Jun 28, 2010

Every time Apple releases a new firmware, they stop signing the older one, which means you technically can’t downgrade to a previous firmware by restoring. Fortunately, if you have your ECID SHSH on file on Saurik’s servers, then you might be able to downgrade your iPhone from iOS 4 to 3.1.3 or earlier.

The trick is to make iTunes believe it is requesting a signature from Apple’s servers while it will actually be talking to Saurik’s servers.

Downgrading from iOS 4 to 3.1.3 does require you saved your SHSH on Saurik’s servers. If you haven’t, then you can’t downgrade.

Downgrade from iPhone iOS 4 to firmware 3.1.3

Step 1 for Windows: Make sure you are logged in with administrator privileges. Launch Notepad and navigate to C:/Windows/System32/drivers/etc. Add the following at the very bottom of the file: 74.208.10.249    gs.apple.com

Now save the file back where you found it.

Step 1 for Mac: In Finder, select Go To Folder, and enter /etc. Search the hosts file and right click on it to open with TextEdit. Add the following at the very bottom of the file: 74.208.10.249    gs.apple.com

Click Save As to save the edited file on your desktop. Name the file hosts, and make sure to uncheck the box that says “if no extension is provide, use .txt”.

Now drag and drop this edited file to /etc.

Step 2: Download the firmware you want to downgrade to from here.

Step 3: Put your iPhone in DFU mode. Launch iTunes and plug your iPhone in. Press and hold the home and and sleep button together for 10 seconds. After exactly 10 seconds, release the sleep button while still holding the home button. Keep holding the home button until iTunes tells you it has found an iPhone in recovery mode.

Step 4: Now hold the Option key (Mac only) or Shift key (Windows only) while clicking the Restore button in iTunes. A dialog box will pop up and you’ll be able to choose the firmware you downloaded in step 2.

Step 5: At this point, some of you will be fine. The iPhone will restore without any problem. However, some of you might end up in recovery mode again. It’s ok. We just need to kick the iPhone out of recovery mode. To do so, download and launch iReb for Windows or iRecovery (both Mac and Windows).

Welcome back to 3.1.3!

[image Life Hacker]

 

How to Save Your iPhone ECID SHSH

By Sebastien Page on Apr 2, 2010

Every time a new iPhone firmware comes out, many of us accidentally update their device to the latest OS, making it impossible to jailbreak/unlock, or even downgrade to an earlier version.

In order to have a shot at downgrading your iPhone, you must have your ECID SHSH on file on Saurik’s server, just in case Apple stops signing the older firmware version, just like it did a few weeks ago with 3.1.2.

How to Save Your ECID SHSH

Note that this is only valid for iPhone 3GS and iPod Touch 2G/3G. iPhone 3G owners are not concerned as they can downgrade the firmware (not the baseband).

The Easy Way

If like me you are lucky and you launch Cydia and see that “this device has SHSHs on file for iPhone OS: 3.0, 3.1, 3.1.2, 3.1.3″, then you don’t have anything to do. I have these 4 SHSHs on file but  it’s ok if you only have the latest SHSH on file. At the time I am writing this, the latest firmware is 3.1.3 so to date, you should make sure you have at least the SHSH for 3.1.3.

The Other Easy Way

If you don’t see this message then don’t worry, just scroll down a bit on Cydia’s homepage and look for the “make my life easier” button. Simply tap on it and your ECID SHSH will be automatically saved on Saurik’s server. Close Cydia and launch it again. You should now have a message at the top saying your SHSH is on file.

You’re good to go now! But remember that anytime a new firmware is available, do not update right away. Just wait until a new jailbreak is available.

 

Downgrade iPhone Baseband 05.12.01 to 04.26.08

By Sebastien Page on Feb 10, 2010

Last week I wrote about downgrading iPhone firmware 3.1.3 to 3.1.2 using an old trick. Unfortunately, this hack worked for downgrading the firmware but it didn’t help downgrading the 05.12.01 baseband that comes with firmware 3.1.3 and makes it impossible to unlock the iPhone.

If you accidentally updated your iPhone 3G to 3.1.3 and lost your unlock, you’re in luck! There is now a way to downgrade iPhone baseband 05.12.01 to 04.26.08 in a few simple steps thanks to Fuzzyband, an application available through Cydia.

Please note that this only works with the iPhone 3G on OS 3.1.3 with baseband 05.12.01 and the older bootloader 05.08. Let me repeat this so it’s clear. This trick will only work for iPhone 3G 3.1.3 baseband 05.12.01 with bootlloader  05.08. This will not work for the iPhone 3GS.

If you’re not sure about your bootloader, simply download and launch Fuzzyband and it will give you more info about your bootloader.

How to Downgrade iPhone Baseband from 05.12.01 to 04.26.08

Step 1: In order to downgrade your iPhone baseband from 05.12.01 to 04.26.08, you must first jailbreak your iPhone using RedSn0w, PwnageTool, or even Sn0wBreeze.

Step 2: After jailbreaking, launch Cydia, then search for and install Fuzzyband.

Step 3: Launch Fuzzyband then tap “Downgrade”, which will start the downgrading process.

Step 4: Reboot your iPhone.

Congrats, you successfully downgrading your iPhone baseband from 05.12.01 to 04.26.08. You should now be able to unlock using UltraSn0w. If you’re not sure how to do that, check out my tutorial on how to unlock iPhone 3.1.3.

 

How to Downgrade iPhone 3.1.3 to 3.1.2

By Sebastien Page on Feb 7, 2010

As always when a new firmware is being realeased, there is always a few unlucky people who “accidentally” update or restore to the latest firmware, thus losing their jailbreak and unlock.

In this case, you’d usually want to downgrade your iPhone from 3.1.3 to 3.1.2 simply by downloading 3.1.2 and SHIFT + Restore in iTunes so that you can choose your own firmware to restore to.

The problem is that Apple recently stopped signing all previous firmware versions making it impossible for you to downgrade.

Fortunately, Saurik has been smart enough to create a system to bypass Apple’s signature and making it possible for you to downgrade from 3.1.3 to 3.1.2. To do so, you will need to have your SHSH on file. To see if it’s on file, launch Cydia and look at the top. Mine says “This device has SHSHs on file for iPhone OS: 3.0, 3.1, 3.1.2″.

If you don’t have this, make sure you look for a link that says “Make my life easier” on Cydia. This will allow you to save your SHSHs.

This being said, downgrading an iPhone 3GS from 3.1.3 to 3.1.2 is easier said than done. It’s actually a pretty painful process that I detailed in a tutorial a few month ago. I originally wrote this tutorial to downgrade from iPhone 3.1 to 3.0 but the steps are exactly identical (MuscleNerd confirmed this).

If you’re one of those who need to downgrade your iPhone firmware, then check out my tutorial, or simply wait for the Dev Team to come up with a reliable jailbreak for 3.1.3. Something tells me PwnageTool is not too far ahead of us ;)

UPDATE: If you have an iPhone 3G, you can now downgrade from baseband 05.12.01 to o4.26.08.

UPDATE 2: This post is slightly outdated. Check out this page for the latest information about downgrading your iPhone.

 

How to Downgrade iPhone 3.1 Baseband From 05.11.07 to 04.26.08

By Sebastien Page on Sep 29, 2009

Every time there is a new firmware coming out, updating puts you at risk of updating your baseband as well, making it impossible to unlock your iPhone. This time is no different than the others and many people accidentally updated their iPhone to firmware 3.1, updating their baseband to 05.11.07 at the same time.

Fortunately, there is an easy way for iPhone 3G users to downgrade their baseband from 05.11.07 to 04.26.08. Note that this is for iPhone 3G users only. If you have an iPhone 3GS, then read my article on how to downgrade the iPhone 3GS firmware from 3.1 to 3.0.

Note that this trick only works on iPhones that have the 05.08 (5.8) bootloader from the factory, which is just a very limited amounts of iPhone 3G that were released in the first few weeks of the production cycle. If you don’t know your bootloader version, you may run Fuzzyband and it will tell you what version you have and whether or not you can downgrade your baseband.

1. First, your iPhone 3G has to be jailbroken. For more information, read my iPhone 3.1 jailbreak article.

2. Launch Cydia and search for the Fuzzyband app. Install it and reboot your iPhone.

3. Launch the Fuzzyband app and tap “downgrade” to start downgrading your baseband from 05.11.07 to 04.26.08.

4. Reboot your iPhone. You should now be on baseband 04.26.08 and be able to jailbreak and unlock your iPhone using UltraSn0w.

 

How to Downgrade iPhone 3GS From Firmware 3.1 to 3.0

By Sebastien Page on Sep 15, 2009

Saurik, the creator of Cydia, has come up with a way to downgrade the iPhone 3GS from firmware 3.1 to firmware 3.0. The method is not for the faint of heart but it can be a life saver if you accidentally upgraded your iPhone 3GS to 3.1. Saurik did a great job at explaining how and why this downgrade works and I invite you to read his article for detailed information. On my part, I will only give you a step by step on how to downgrade from 3.1 to 3.0.

1. First and foremost, you must have saved your ECID file through Cydia. If this was done, you should see the following message at the top of Cydia’s homepage: This iPhone 3G[S] has an ECID SHSH on file.

2. Now we’re going to duplicate the functionality exposed by Apple’s signature server and trick iTunes into thinking it is connected to Apple’s servers. Make sure you have iTunes 9 installed on your computer.

On a Mac, go to /etc/hosts. On a PC, go to C:\Windows\System32\drivers\etc\hosts. Open the file in a text editor and add the following entry at the bottom of the file: 74.208.105.171 gs.apple.com

Save the file and close it.

3. Now we have to put your iPhone into DFU mode. To do this, open iTunes, plug your iPhone and hold down the power and home buttons for 10 seconds, then let go of the power button but continue to hold the home button until iTunes recognizes the device with the message: “iTunes has detected an iPhone in recovery mode. You must restore this iPhone before it can be used with iTunes.” Your iPhone screen should be completely black. If you see an image on your screen, you most likely didn’t perform the previous step correctly. Try again.

4. You can now do a “normal” restore to the 3.0 software. To do this, hold down the Option key (on Mac OS X) or the SHIFT key (Windows) while clicking the Restore button in iTunes. Select the firmware 3.0 (which can be downloaded here).

Theoretically, you should be done with the downgrade. That’s just for the theory though… You’re most likely going to get several errors.

If you get the “unknown error (3002)”, it’s because you probably don’t have your ECID SHSH’s for 3.0 on file with Cydia and it is unfortunately impossible to register your device with Cydia anymore. There is no solution, your iPhone can’t be downgraded from 3.1 to 3.0 and you’re gonna have to wait for a new jailbreak.

If you get the “The iPhone “iPhone” could not be restored. An unknown error occured (1015)” error, then re-do the process all over again. You will get the same error again and it is normal. Ignore the error and jailbreak your iPhone using RedSn0w.

I agree that this is definitely not the easiest way to downgrade your iPhone from firmware 3.1 to firmware 3.0, but you don’t have much choice at this point. If you don’t feel like taking on this project, I suggest you just wait for a proper 3.1 jailbreak, which may take days, weeks, or months. I am very confident that the jailbreak community is getting closer to a 3.1 jailbreak though.

If you have any tips and tricks to make this whole process smoother, or if you have any question, please leave a comment.

UPDATE: If you have an iPhone 3G, you can now downgrade from baseband 05.12.01 to o4.26.08.

 

How to Downgrade Baseband 2.30.03 to 2.28.00

By Sebastien Page on Feb 4, 2009

If you like this post, please feel free to digg it, or subscribe to our RSS feed, or follow me on Twitter, or all of the above ;)

[digg-me]Since firmware 2.2.1 came out and updated the baseband from 2.28.00 to 2.30.03, many people accidentally updated, and are now stuck on baseband 2.30.03. I wonder how you can “accidentally update” your firmware as it takes a few steps, but anyways… I’ve had a few emails from people asking me how to downgrade baseband 2.30.03 to 2.28.08.

If you’re looking to unlock your iPhone with YellowSn0w, you can’t do that as long as you will on baseband 2.30.03. Unfortunately, you can not downgrade baseband 2.30.03 to 2.28.00! Sorry folks but you should have read the Dev Team’s warning!

Now the good news is that I’m very confident the Dev Team is working on updating YellowSn0w so it works with firmware 2.2.1, baseband 2.30.03.

You can still downgrade your firmware from 2.2.1 to 2.2 in iTunes by hitting SHIFT + RESTORE and selecting firmware 2.2 but you will most likely have errors and even if you manage to downgrade, you still won’t be able to downgrade the baseband.

UPDATE: It’s now possible to downgrade your baseband thanks to pHaseBanDowngrader

pH (Pedro Henrique Franceschi) created a tool to help you downgrade your baseband from 2.30.03 to 2.28.00. To use this tool, you have to have to have an iPhone with bootloader 5.8. If your iPhone was manufactured before September 2008, you’re good. If you bought your iPhone after September 2008 with firmware 2.2.1 out of the box, then you can’t use pHaseBanDowngrader because your bootloader is 5.9.

Here are the instructions on how to downgrade using pHaseBanDowngrader:

1. Download this file
2. SSH into your iPhone and put the downloaded folder (phasebandowngrader) inside the folder /Applications/
3. In MobileTerminal.app, type “login” and enter “root” as user, the default password is “alpine”
4. Now, type “cd /Applications/phasebandowngrader && ./phasebandowngrader”. Follow the screen instructions
5. Done!

Again, a big Thank You to pH for developing this tool.

 
Page 3123