TinyUmbrella lets you update iPhone 4 to iOS 4.2.1 while preserving its baseband 01.59.00 which is unlockable with UltraSn0w. In this guide, you’ll learn how to update iPhone 4 to iOS 4.2.1 firmware while preserving baseband 01.59.00 using TinyUmbrella.
Updating iPhone 4 to iOS 4.2.1 also updates your baseband to 03.10.01 which is NOT unlockable at the moment. However, if you update your iPhone 4 to iOS 4.2.1 while running TinyUmbrella TSS server, it’ll preserve its baseband 01.59.00 and update iOS 4.2.1. Lets learn how to use TinyUmbrella to update iPhone 4 to iOS 4.1 while preserving baseband 01.59.00.
WARNING: This method applies to iPhone 4 only. iPhone 3GS and 3G users MUSt stay away from it and wait for an UltraSn0w update. I have tested this method myself on my iPhone 4 and it works like a charm.
How to Update iPhone 4 to iOS 4.2.1 + Preserve Baseband 1.59.00
Step 1
- Download TinyUmbrella 4.21.05
- Download iOS 4.2.1 for iPhone 4
Step 2
- Run TinyUmbrella
***READ the TinyUmbrella README NOW. You Read it.
- Hit the Save SHSH button and make sure iPhone 4 4.2.1 SHSH blob is listed.
Step 3
Hit the Start TSS Server button. It will kill iTunes.
Step 4
- Check for ANY error.
- 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 4.2.1 firmware
Step 5
Let iTunes error with 1013 error (baseband update failed – we want this 🙂 )
That’s it. You have successfully updated iPhone 4 to 4.1 with 1.59.00 baseband. Now follow the link below to get out of recovery mode and jailbreak iPhone 4 with Greenpois0n.
Also checkout:
- How to: Downgrade iOS 4.3 to iOS 4.2.1
- How to: Save SHSH blobs for iPhone