How-to Upgrade iOS 4.2.1 Preserving Baseband

Preserving baseband during upgrade is a thing of concern for iphone unlockers. Jailbroken phones get the baseband updated while upgrading to latest iOS version and loose their unlock in the process. But there is a trick to Preserve Your Baseband during Upgrade . Follow the detailed upgrade tutorial below to preserve your original baseband and not upgrading to 03.10.01 .

iOS-4.2 download upgrade

Very Important :

Steps to Upgrade to iOS 4.2.1 Preserving Baseband

  1. Install TinyUmbrella on your computer and exit iTunes
  2. Connect your device to the computer
  3. TinyUmbrella will then detect your device and display it on the left hand panel . Select your device and click on Save SHSH button .
  4. After the SHSH files are saved launch iTunes 10.1 and select your device.
  5. Now click on Restore tab . Keep TinyUmbrella running in the background . tiny umbrella
  6. After the Restore has been completed you will see the Connect to iTunes symbol on your device . Close iTunes and goto TinyUmbrella window and click Exit Recovery button .
  7. Iphone 4 will now show the Apple Logo and start-up. We are done .

To check the iOS version and baseband , goto Settings General About . Scroll at the bottom and you can see the latest iOS version of your device.

Useful Links :

Below is a quick 5 minute video from GadgetsDna which will show you exactly how you can upgrade to iOS 4.2 without upgrading the baseband to 03.10.01.

Upgrade to iOS 4.2.1 Preserving Original Baseband – Video :

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Below is an image shared by our reader Lunar : His iphone 4 is on iOS 4.2.1 with the baseband intact [02.10.04] . Image Credit

ios 4.2.1 baseband preserved

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