Here’s How To Downgrade iPhone 06.15.00 Baseband to 05.13.xx (iPhone 3G Bootloader 5.8 Only)

The following method will help you downgrade the baseband of iPhone 3G from 06.15.00 to 5.13.xx, which is unlockable using Ultrasn0w. This method will also enable you to restore your device on the official stock firmware using iTunes which was otherwise not possible on iPad’s 06.15.00 baseband.

You Will Soon Be Able to Downgrade Baseband 06.15.00 to 05.15.04 on iPhone 3GS / 3G

Earlier today, MuscleNerd confirmed that he has got a “backup” method of making jailbreak untethered on iOS 4.2.1. This new method utilizes iOS 4.2b3 (Beta 3) SHSH blobs which Cydia only recently started saving for all iOS devices.

Downgrade iOS 4.1 iPhone 4, 3GS, 3G and iPod touch to iOS 4 / iPhone 3.1.3 / 3.1.2 [How to Guide]

iOS 4.1 Beta was seeded to developers yesterday. Since the iOS 4.1 is currently onlyjailbreakable on iPhone 3G and iPod touch 2G (non-MC model), you may want to downgrade your other iOS based devices from iOS 4.1 so that you can jailbreak them on iOS 4, or iOS 3.1.3 / 3.1.2 (formerly iPhone 3.1.3 or 3.1.2).
The following step by step guide will help you rollback / downgrade to iOS 4, iPhone 3.1.3 and 3.1.2 from iOS 4.1 Beta as long as you have SHSH blobs saved for the respective firmwares for iPhone 4, iPhone 3GS, iPhone 3G and iPod touches.


Step 1: Download the required old ipsw firmware files. (Download links: iOS 4, 3.1.3,3.1.2)
Step 2: Put your device into DFU mode (not recovery mode).

• Connect your iPhone to your computer.
• Turn iPhone off.
• Start iTunes.
• Hold Power and Home buttons together for 10 seconds or so.
• Release Power button but keep holding the Home button until your computer recognizes a new USB device.
• iTunes will now recognize your iPhone.

Note: Your iPhone screen at this time should be blank (black in color), if not, then you are most likely in Recovery Mode, not DFU mode.
(Step 3 is for iPhone 4 and iPhone 3GS users only. If you are on iPhone 3G or iPod touch 2G (non-MC model), skip Step 3 and continue from Step 4)
Step 3: This step is applicable to iPhone 4, iPhone 3GS, iPod touch 3G and iPod touch 2G(MC model) which have their SHSH blobs (ECID SHSH) saved on Cydia for the firmware you downgrading on. If you don’t have your SHSH files saved, you cannot downgrade the mentioned devices.
So what we will do is to trick iTunes into thinking that it is watching Apple servers, while in real, we are going to change the address to Saurik’s server.

• Navigate to C:\Windows\System32\drivers\etc\ and locate “hosts” file.

Mac users can get to “/etc/” directory by going through “Go –> Go to Folder” from Finder.

• Open this “hosts” file in Notepad (for Windows) or TextEdit (for Mac OS X) and add this

74.208.105.171 gs.apple.com

line as shown in the screenshot below:

Now simply save this file and you are good to go!
NOTE for Windows 7 and Vista: Start “Notepad” with Administrator privileges by right clicking on “Notepad” app, and click on “Run as Administrator“ option.
Step 4: You will now have to restore your iPhone or iPod touch to the firmware you downloaded in Step 1. Click on your phone icon from the sidebar in iTunes. Now press and hold left “alt” (option) button on Mac (Left “Shift” button on Windows) on the keyboard and then click on “Restore” (Not “Update” or “Check for Update”) button in the iTunes and then release this button.

This will make iTunes prompt you to select the location for your downloaded firmware file. Select that ipsw file and click on “Open”.
Step 5: Now sit back and enjoy as iTunes does the rest for you. This will involve a series of automated steps. Be patient at this stage and don’t do anything silly. Just wait while iTunes installs firmware on your iPhone or iPod touch. Your iPhone screen at this point will be showing a progress bar indicating installation progress. Now at some point, iTunes will throw 1011, 1013 or 1015 error at you. This is normal, just ignore this error as the firmware has already been successfully installed on the device.
Step 6: Now you will need to exit your device from Recovery Mode. To do this, download a program called RecBoot (Windows / Mac). Run it and the click on “Exit Recovery Mode” button. Your device will now restart normally.

This is it, you should now be able to jailbreak your device on this older OS.  For iPhone 3.1.2 firmware, you can use blackra1n, PwnageTool, redsn0w, sn0wbreeze, ultrasn0wand blacksn0w to jailbreak and unlock your iPhone and iPod touch. For iPhone 3.1.3 firmware for iPhone 2G, 3G, 3GS and iPod touch 1G/2G, you can use redsn0w 0.9.3,redsn0w 0.9.4, sn0wbreeze, PwnageTool 3.1.5. Unlocking can be done using ultrasn0w orblacksn0w. iPhone 3.1.3 (on devices with new bootrom and baseband) can use Spirit to jailbreak iPhone 3GS/3G and iPod touch 3G/2G.
You may also like to check out:

• Fix 1604, 1600 Error During iOS 4 Custom Firmware Restore in Tunes
• Save SHSH Blobs (ECID SHSH) of iOS 4 on Windows and Mac [iPhone 4 Guide Here]
• Jailbreak iOS 4 on iPhone 3GS (New Bootrom) with SHSH Blobs [How to Guide] – Mac version here
• How to Unlock iOS 4 with Ultrasn0w and Blacksn0w on 05.13.04 Baseband [Guide]
• How to Jailbreak iOS 4.0 on iPhone 3GS, iPhone 3G and iPod touch 2G using Redsn0w, PwnageTool 4.0 (Windows)

You can follow me on twitter to keep yourself updated on all the latest jailbreaking and unlocking releases.

Source: redmondpie

Downgrade iPhone 3GS iOS 4.0 to 3.1.3 with Cydia SHSH

Apple released iOS 4.0, so as of today, Apple has stopped signing 3.1.3 restore files. That means that if you have a 3GS iPhone you cannot restore any firmware other than iOS 4. If you guys updated to iOS 4 and wanna go back to OS 3.1.3 or below here is the step by step guide to downgrade your iPhone 3GS iOS 4 to 3.1.3 or below. This hack can be attempted only for those, who saved their SHSH to Cydia Server before the release of iOS 4.0 via Cydia “make my life easier” button.

The process is very simple all you have to do is to add Saurik’s Server address to your system hosts file. This trick make iTunes thinks it is talking to Apple, it is talking to Cydia instead while the restoring process. Doing this will allow iTunes to access signatures already stored by Cydia “on file” feature. In simple words this duplicates the functionality exposed by Apple’s signature server, except using “on file” results rather than live request.

Note:

1. This process is only for those who saved their SHSH to Cydia Server already.
2. Read the whole process two-three times before starting the process.

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How to Edit and Save Hosts file in Windows

• Open Notepad with Administrative privileges by clicking Start, All Programs,Accessories, and thenright-click Notepad and select to open as Administrator.

• Now browse to (C:/Windows / System32 / drivers / etc) in Notepad and open the hosts file, and add the following entry to the bottom of the file.
  

  74.208.10.249    gs.apple.com               <————

Now you navigate to files menu and save the hosts file. By doing this you changed the communication server from Apple to Sauriks Server, because your ECID is on that server. Now you can put your iPhone in DFU mode to restore back to to OS 3.1.3 or lower. Follow our previous guide Downgrade iPhone 3G / 3GS

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How to Edit and Save Hosts file in Mac OS X

• Navigate to Finder, Click to select Go to Folder… from the Go menu and Enter /etc into the input field and click the Go button.
• Now look for hosts file, right click on hosts file and open with Text Edit, and add the following entry to the bottom of the file.

74.208.10.249   gs.apple.com <————

• Now save the file and click on Save As.
• Because Text Editor can’t save your system files, here comes the tricky part, in save as windows use the following settings, take a close look at the following image.

Uncheck the “ If no extension is provide, use .txt “ and then press the save button.

• A host file will be appear on your Desktop, just drag and drop to /etc and follow the onscreen instructions. 

By doing this you changed the communication server from Apple to Sauriks Server, because your ECID is on that server. Now you can put your iPhone in DFU mode to restore to any of the previous OS. Follow our previous guide Downgrade iPhone 3G / 3GS

Stay tuned with us for your daily dose of iPhone news, you can follow us on twitter via @iTune2iPhone You can also subscribe to our daily free e-mail news letter and keep your self updated with the latest of iPhone community.

Source: ihackintosh

Downgrade iPhone 3G 3.1.3 Baseband 05.12.01 With Fuzzyband

Good news for those who upgraded their iphone3G to OS 3.1.3 and lost their baseband. As you know Apple introduced a new baseband 05.12.01 with iPhone OS 3.1.3 update, and latest baseband 05.12.01 is  un-hackable at the moment because Ultrasn0w/Blacksn0w doesn’t support. Bigboss released Fyzzyband 3.1.3-1 a while ago in Cydia. Fuzzyband Downgrader is a saferiPhone 3G Baseband Downgrader as this one detects your baseband and bootloader version and does the right thing first.

In other words Fuzzyband Downgrader detects your bootloader and baseband and downgrade it with a simple click if your bootloader is vulnerable to Fuzzyband . Fuzzyband Downgrader available in Cydia, just refresh your sources and search for Fuzzyband and install the application

Please Note :

• Downgrading works from any version greater than 4.26.08. It will put your baseband back at version 4.26.08 which is hackable by ultrasn0w.
• Downgrading only works on iPhone 3G with 05.08 (5.8) Bootloader from the factory. This is a very limited number of phones that were released in the first few weeks of the 3G production cycle.
• If you do not know your bootloader then you can run Fuzzyband and it will report the version number for you.
• iPhone 3GS and large numbers of iPhone 3G aren’t supported by the Fuzzyband, so in case your baseband is updated then wait for Dev team/GeoHot to release any workaround. This may take weeks or months.

Stay tuned with us for your daily dose of iPhone news, you can follow us on twitter via @iTune2iPhone and keep your self updated with the latest of iPhone community.

Source: ihackintosh

Downgrade iPhone 3GS OS 3.1.3 to 3.1.2 With Cydia SHSH

Apple released OS 3.1.3 very unexpectedly, OS 3.1.3 for iPhone 3GS is incompatible to jailbreak with redsn0w/pwnage tool/sn0wbreeze. So as of today, Apple has stopped signing 3.1.2 restore files. That means that if you have a 3GS iPhone you cannot restore any firmware other than 3.13.  If you guys updated to 3.1.3 and wanna get back to OS 3.1.2 or below here is the step by step guide to downgrade your iPhone 3GS OS 3.1.3 to 3.1.2 or below. This hack is useful only for those peoples who saved their SHSH to Cydia Server before the release of OS 3.1.3 via Cydia “make my life easier” button.

The process is very simple all you have to do is to add Saurik’s Server address to your system hosts file. This trick make iTunes thinks it is talking to Apple, it is talking to Cydia instead while the restoring process. Doing this will allow iTunes to access signatures already stored by Cydia “on file” feature. In simple words this duplicates the functionality exposed by Apple’s signature server, except using “on file” results rather than live request.

Note:

1. This process is only for those who saved their SHSH to Cydia Server already.
2. Don’t use this procedure for 3.0.1, because Saurik Server do not have signatures for 3.0.1
3. Read the process and Saurik post two-three times before starting the process.
4. iPhone unlockers note that by doing this you can downgrade your firmware only, your baseband is still at 05.12.01 which is un-hacked at the moment.

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How to Edit and Save Hosts file in Windows

• 
  
  Open Notepad with Administrative privileges by clicking Start, All Programs,Accessories, and thenright-click Notepad and select to open as Administrator.
  

• 
  
  Now that Notepad is open with Administrative privileges browse to (C:WindowsSystem32driversetc) in Notepad and open the hosts file, and add the following entry to the bottom of the file.

  74.208.10.249    gs.apple.com                 <————

Now you navigate to files menu and save the hosts file. By doing this you changed the communication server, and then we will ensure that iTunes checks the firmware on the server rather than opens Saurik toApple! Because your ECID is on that server, the verification will fail and restore the previous version will be done without too many problems!

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How to Edit and Save Hosts file in Mac OS X

• Navigate to /etc and look for hosts file, right click on hosts file and open with Text Edit, and add the following entry to the bottom of the file.

74.208.10.249   gs.apple.com            <————

• Now save the file and click on Save As.
• 
  
  Because Text Editor can’t save your system files, here comes the tricky part, in save as windows use the following settings. Or take a close look at the following image.
  

1. In Where locate to Desktop
2. Uncheck the “ If no extension is provide, use .txt “ and then press the save button.

• A host file will be appear on your Desktop, just drag and drop to /etc and follow the onscreen instructions.
• Press the Replace and enter your Password

By doing this you changed the communication server, and then we will ensure that iTunes checks thefirmware on the server rather than opens Saurik to Apple! Because your ECID is on that server, the verification will fail and restore the previous version will be done without too many problems!

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Now you can do your Normal Restore to 3.1.3 (with Recovery Mode) and Downgrading from 3.1.3 to 3.1.2 or below (with DFU Mode) as usual. For more details on Recovery Mode and DFU Mode read our previous article here.

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To Downgrade iPhone 3GS from 3.1.3 to 3.1.2 or below :

Step 1: Put your iPhone in DFU mode with following instructions.

• Connect your iPhone to your computer.
• Turn iPhone off.
• Hold power and home together for 10 seconds (exactly).
• Release power but keep holding home until the computers beeps (observed on a PC) as a USB device is recognized.
• A few seconds later iTunes should detect your iPhone.
• If the Restore Logo is present on the screen, you are in Recovery Mode, not DFU.

Step 2: Once your iPhone is in DFU mode following message will be appeared in iTunes. Click on “OK” , Now hold Option key while clicking Restore in iTunes and browse the OS 3.0 firmware for your iPhone 3GS. Now the restore process will take 10 – 15 minutes.

If you encountered an error message like 1011, 1013, 1015, just ignore them(Actually the firmware 3.0 is already successfully installed). Simply launch RedSn0w and do the Jailbreaking Unlocking process again. Check our guides on Jailbreaking iPhone here.

But if you encountered with error message like 1601, 1602, 1600 or anything else then try putting the iPhone into DFU mode and try again.

Stay tuned with us for your daily dose of iPhone news, you can follow us on twitter via @iTune2iPhone and keep your self updated with the latest of iPhone community.

Source: ihackintosh

Downgrade iPhone 2G 3G OS 3.1.3 to 3.1.2 or lower

Dev team already warned don’t upgrade to 3.1.3 and wait for next version of Pwnage Tool to preserve your baseband. Upgrading to 3.1.3 with Ultrasn0w/Blacksn0w installed will cause people to lose their unlock and will be unable (for the time being) to get it back. OS 3.1.3 contains a baseband update 05.12.01 BB for iPhone 3G and 3GS. The latest  Modem Firmware 05.12.01 BB is not down gradable. So if you accidentally updated your iPhone 2G, 3G or 3GS to OS 3.1 here is the handy guide for downgrading.

Remember this will not downgrade your baseband only your firmware will be downgraded. It’s possible todowngrade OS however we strongly suggest you to carry on with OS 3.1.3 until Dev team update Pwnage Tool or redsn0w Tool.

Update for iPhone 3GS : So as of today, Apple has stopped signing 3.1.2 restore files. That means that if you have a 3GS iPhone you cannot restore any firmware other than 3.1.3 But in case you was wise/lucky enough to save your Cydia SHSH files on Saurik server follow the link below for iHackintosh guide.

Step by Step Guide to Downgrade iPhone 2G and 3G

Step 1: Make sure you have latest iTunes installed, Now connect your iPhone to your computer.

Step 2: Put your iPhone 2G/3G in DFU mode with following instructions.

• Connect your iPhone to your computer.
• Turn iPhone off.
• Hold power and home together for 10 seconds (exactly).
• Release power but keep holding home until the computers beeps (observed on a PC) as a USB device is recognized.
• A few seconds later iTunes should detect your iPhone.
• If the Restore Logo is present on the screen, you are in Recovery Mode, not DFU.

Step 3: Once your iPhone is in DFU mode following message will be appeared in iTunes. Click on “OK” , Now hold Option key while clicking Restore in iTunes and browse the OS 3.1.2 or below firmware for your iPhone 2G, 3G. Now the restore process will take 10 – 15 minutes.

Step 4: If you encountered an error message like 1011, 1013, 1015, just ignore them(Actually the firmware 3.0 is already successfully installed). Simply launch RedSn0w and do the Jailbreaking Unlocking process again. Check our guides on Jailbreaking iPhone here.

But if you encountered with error message like 1601, 1602, 1600 or anything else then try putting the iPhone into DFU mode and try again.

Disclaimer : This process is universal and tested several times though we are not responsible for and damage (if any) so use it at your own risk. If you like our work then consider to digg the story and help us by spreading the word.

Stay tuned with us for your daily dose of iPhone news, you can follow us on twitter via @iTune2iPhone and keep your self updated with the latest of iPhone community.

Source: ihackintosh