technology

It was possible that you have the curiosity to experiment iOS 4.2.1 GM new features which was released yesterday to iPhone 4, 3GS, 3G, iPod touch 4G, 3G, 2G and iPad, if you still didn't, you can download and jailbreak it now from here. You will note that Cydia still have some issues, the matter which make jailbreak pointless for many.


Moreover the new iOS 4.2.1 GM build has a new baseband version which puts a lot of doubts around the upcoming unlock. Therefore I prepared the downgrade guide from iOS 4.2.1 GM to iOS 4.1, 4.0.2, 4.0.1 or lower.
STEP 1: Download iOS 4.1 or older firmwares for iPhone or iPod Touch.

STEP 2: Put your iPhone in DFU Mode by following this steps,

• 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 iPad.

STEP 3: If you are on iPhone 3G or iPod touch 2G (non-MC model) bypass this step. This step is about adding Saurik’s Server address to your system hosts file. This trick make iTunes thinks it is talking to Apple, while it is talking to Cydia while the restoring process.

• Locate "C:\Windows\System32\drivers\etc\" for Windows and "/etc/" directory for Mac, then locate “hosts” file andOpen it in Notepad (for Windows) or TextEdit (for Mac OS X) and add this at the bottom of the file.

74.208.105.171 gs.apple.com

At last it will be like that, then save it

STEP 4: Now, You will have to restore your iDevice to iOS 4.1, 4.0.2 or 4.0.1  by clicking on the iPhone icon on the left sidebar of iTunes then hold left “alt” button on Mac (“Shift” button on Windows) on the keyboard and then click on “Restore” then release the alt button, Now Select the iOS 4.1, 4.0.2 or 4.0.1 ipsw file you have already downloaded in Step 1 and let iTunes do some automated Steps.
STEP 5: You will need to exit recovery mode, so download TinyUmbrella (Windows / Mac). Run it and the click on “Exit Recovery” button. Your device will now restart normally.

Now you got back to iOS 4.1, 4.0.2 or 4.0.1 and you can jailbreak your iPhone using our guide posted here.

Guys over MacRumors have found some error messages in the newly released iOS 4.2.1 GM claiming to options for a free MobileMe service. As you can notice in the screenshot below, the code mentions free MobileMe accounts for all iOS devices. The code also points to that MobileMe mail will not be available in the free MobileMe package.


Anyway, we'll keep you informed in case Apple will release a free version of MobileMe for iOS devices, stay tuned.

Today we broke the news about the release of iOS 4.2.1 GM for iPhone 4, 3GS, 3G, iPod touch 4G, 3G and iPad. Now you can use Redsn0w 0.9.6b2 to jailbreak all these iOS devices. Moreover I have collected the direct download links for iOS 4.2.1 GM to all above mentioned devices.


You have to note that Cydia doesn't work till now due to some issues on the private APIs used by Cyida which has been changed by Apple. Bud don't worry the developers has fixed these issues and it is only a matter of time as they are waiting for the iOS 4.2.1 public release. For now you can install jailbroken-apps via SSH - until we got the new Cydia version - as you have full root access on your iOS device.

STEP 1: Download redsn0w 0.9.6b2,  iOS 4.2.1 GM and iOS 4.1 final version for iPhone 4, 3GS, 3G, iPod touch 4G, 3G (download links at the end).

STEP 2: Update to 4.2.1 GM firmware using the IPSW file you just downloaded via iTunes.

STEP 3: Launch Redsn0w 0.9.6b2,  and Browse for iOS 4.1 firmware final version (NOT iOS 4.2.1 GM). 

STEP 4: Select "Install Cydia" and click on Next

STEP 7: You will Get a Jailbroken Device on the latest iOS 4.2.1 GM as soon as the process ends.

NOTE: If you have an unlocked iDevice with ultrasn0w, you have to stay away from Redsn0w, as it updates your baseband to latest version, which is still unlockable till now.

Download iOS 4.1 (Final version) for iPhone 4, 3GS, 3G, iPod touch.
Download iOS 4.2.1 GM for iPhone 4.
Download iOS 4.2.1 GM for iPhone 3GS.
Download iOS 4.2.1 GM for iPhone 3G.
Download iOS 4.2.1 GM for iPod touch 4G.
Download iOS 4.2.1 GM for iPod touch 3G.
Download Redsn0w 0.9.6b2 for Windows and Mac
Download iTunes 10.1 for Windows or Mac

[Download Links via GumballTech]

Apple has just posted a new GM seed in the iOS developer center. The build shows that it’s a GM seed for iOS 4.2.1.


A reliable source of MacStories  informed them that Apple released this build internally last night, and it’s aimed at fixing major Exchange and audio issues. The source also claims that Apple might release iOS 4.2.1 next week skipping iOS 4.2.

This GM build is meant for members enrolled in the iPhone Developers Center, you can get it from the link below if you are one of the registered members:

Download iOS 4.2.1 GM for Developers