Mastery of the iPod Starts Here
How To Update iPhone 4 To iOS 4.1 Without Updating the Baseband/Modem Firmware
Download the latest TinyUmbrella (4.1.3) from here (Windows / Mac), and the original iOS 4.1 firmware for iPhone 4 from here.
Step 2:
Go through the readme file here.
Step 3:
Run TinyUmbrella and Start TSS Server.
Step 4:
Now run iTunes and restore (Not Update) your iPhone 4 to stock iOS 4.1. To do this, 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:
While restoring, iTunes at some point will throw 1004 error (baseband update failed).
Step 6:
Your iPhone at this point will be stuck in Recovery Mode, showing that “Connect to iTunes” screen. To exit your device from Recovery Mode. Click on “Kick Device Out of Recovery” button as shown in the screenshot below to restart your device normally.
Once your iPhone 4 restarts, you will find it on iOS 4.1 with the older 1.59.00 baseband !
Related posts:
- How To Update iPhone 4 to iOS 4.2.1 While Preserving 01.59.00 Baseband[Windows/Mac]
- How To Update iPhone 4 on 4.2.1 Firmware using Custom Restore with 01.59.00 Baseband
- How to Update Your iPhone 4 Without Upgrading the Baseband (Mac)
- How To Update Your iPhone 3GS To 4.2.1 While Preserving The Baseband as 05.13.04
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