How to Update iPhone 4 to iOS 4.2.1 + Preserve Baseband 01.59.00 - iPhoneHeat

How to Update iPhone 4 to iOS 4.2.1 + Preserve Baseband 01.59.00

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

Step 2

  • Run TinyUmbrella
    ***READ the TinyUmbrella README NOW. You Read it.
    iphone 4 4.2.1 baseband 01.59.00
  • Hit the Save SHSH button and make sure iPhone 4 4.2.1 SHSH blob is listed.
    iphone 4 4.2.1 baseband 01.59.00

Step 3

Hit the Start TSS Server button. It will kill iTunes.

iphone 4 4.2.1 baseband 01.59.00

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:

16 comments… add one
ithoo February 4, 2011, 8:44 pm

Did anybody try for this method?

DP February 7, 2011, 12:37 pm

Yes, i did. My iphone 4 now is at 4.2.1 with 01.59 BB. Only one thing: you cannot kick it out of recovery mode by Tinyumb, but continue running GP to jailbreak. That’s all. Very easy!

RonC February 16, 2011, 8:56 am

Thanks DP, i thought i’ll be stucked in recovery mode, kept on jb as what u commented and that’s it!!!!

Godfred30 February 4, 2011, 10:55 pm

waiiting for windows version of greenpois0n before i can try this,i cant wait!!!!

Exos February 5, 2011, 1:00 am

I have to say, I’m not an expert by any stretch of the imagination, but in the same context i’m not new to jailbreaking at all, but my iPhone 4 is now left in a constant recovery loop, this didn’t work for me at all and I followed it to the letter!

Even went through the Greenpoison JB on my Mac in DFU mode.

Going to try it on my other iPhone only difference there is that it is on a later FW (4.1 instead of 4.01)

mzakaria250 February 5, 2011, 4:56 am

Yeah, I have tried it and it burned it out the new modem
Im really angry because I lost the unlock to my phone …. !!!!!
I am extremely angry !

mike February 5, 2011, 11:54 am

here is a new video tutorial:

sp_pingz February 6, 2011, 7:50 pm

If I do this, will my purchased apps deleted?

Somarto February 9, 2011, 5:37 pm

It works 🙂
Thanks a lot Guys, keep up the good work

NeedHelp September 7, 2011, 12:03 am

I get iTune error 6 and when I try to jail break it fails 🙁
What am I doing wrong? Can you help?

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