In this guide you’ll learn how to update iPhone 4 to iOS 4.1 without updating baseband 01.59.00 which is unlockable.

update iphone 4 to iOS 4.1

Restoring iOS 4.1 on iPhone 4 also updates its baseband 01.59.00 to 2.10.4 which is NOT unlockable at the moment. So, iOS 4.1 is an alarming update for all those depending on unlock. PwnageTool by Dev-Team has the ability to preserve iPhone baseband but unfortunately it’s not yet updated with iOS 4.1 support.

When we talk about the jailbreak community, there’s always an alternate way to get things done. Notcom, the dev behind TinyUmbrella app that let you save shsh blobs for iPhone, iPad and iPod Touch has updated TinyUmbrella to 4.1.3 which lets you update iPhone 4 to iOS 4.1 without updating Baseband (Preserves baseband at 1.59.00 ). Lets learn how to use TinyUmbrella to update iPhone 4 to iOS 4.1 while preserving baseband 01.59.00.

WARNING: If unlock is the only way for you to use your iPhone as a phone, then we strongly recommend you to avoid iOS 4.1. If you’re brave enough to give it a shot, follow the steps below at your own risk.

THIS GUIDE APPLIES TO IPHONE 4 ONLY.

How to Update iPhone 4 to iOS 4.1 Without Updating Baseband 1.59.00

Step 1

Download TinyUmbrella 4.1.3
Download iOS 4.1 for iPhone 4

Step 2

Run TinyUmbrella
***READ THE README TinyUmbrella README NOW Yes. You Read it.
Hit the Start TSS Server button

Step 3

Now open the iTunes. Hold down the SHIFT (Windows) or Alt/Option (Mac) key and hit the Restore button on iTunes.
Then browse and select your downloaded iOS 4.1 firmware

Step 4

Let iTunes error with 1004 error (baseband update failed – we want this )

No simply hit the Kick Device Out of Recovery button on TinyUmbrella.

That’s it. You have successfully updated iPhone 4 to 4.1 with 1.59.00 baseband. Now wait for a new jailbreak tool to come out and then you’ll be able to jailbreak and then unlock iPhone 4 with UltraSn0w 1.1-1.

Also checkout:

How to: Downgrade iOS 4.1 to iOS 4.x

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