Apple Has Added Baseband Requirement In iOS 4.2.1

iOS 4.1

It looks like Apple has just added another hurdle for users who want to unlock their iPhone.

Semaphore, developer of Firmware Umbrella (originally called TinyUmbrella) has just revealed that Apple has added a baseband requirement in iOS 4.2.1 that prevents users from using Firmware Umbrella.

Semaphore reports:

It seems that Apple has decided to put a baseband requirement on iOS. So at this point, if you are using Saurik’s server or tiny umbrella and trying to restore 4.2.1 on an iPhone 4, you will end up in recovery mode and tiny umbrella will not be able to pull you out of recovery.

This means that tools like Firmware Umbrella allow you to update your iPhone 4 to the latest firmware but preserves the baseband from getting upgraded will not work.

Semaphore has provided the following advice if you are stuck while trying to restore iOS 4.2.1 on an iPhone 4:

In this case, you will have to restore 4.1 again or you will have to restore 4.2.1 stock and be tether jailbroken. (Of course, I recommend 4.1 and not bothering with 4.2.1 at all). If you are an unlocker, this is a no brainer. Do not update to 4.2.1 even to test it at this point.

However, MuscleNerd has clarified that this change seems to only impact Firmware Umbrella:

4.2.1 is running fine on my i4 with 01.59 BB. I think they simply killed Umbrella way.

If you want to software unlock your iPhone then you should stay away from iOS 4.2.1 and also avoid tools like Redsn0w.

We’ll let you know as soon as we’ve any further updates on this developing story so stay tuned here at iPhone Hacks or follow us on Twitter or subscribe to our RSS feed.

Apple continues to up the ante in the cat and mouse game with the iPhone hacking community. Let us know what you think in the comments section below.

[via Firmware Umbrella blog]

Like this post? Share it!
  • Thor

    I really need/want find my phone. I do not need to worry about an unlock for 22 months (resale value) but this seems like a high price to pay. B. Jobs is getting smart.

  • Geekinit

    I don't understand why they are so stuck on preventing unlocking. AT&T giving Apple kickbacks or what?

  • davidj

    for the iphone 3gs ios4.1 and bb5.14.02 holder, friendly request to release the unlock software as soon as you can so that we all benefit to use it. thx

  • Mucha

    I am interested only in jailbreaking as i unlocked my phone from my service provider 3 for just 15pounds.Now my iphone 4 32gb is factory unlocked.

  • They will never stop trying to lock us, and we will ever rest, because all we have to do is win. Long life to jailbreakers and unlockers. Open source rules!

  • JayRolla

    Remember ATT and Apple have/had a contract. If Apple does not try to stop the unlocking that may void something in there contract with each other. If I payed tons of money to make the iphone exclusive to my company, I damn well would want that company to fight the people trying to unlock them.

  • Tony

    Hey people, my Iphone3G is JB at v3.1.3 Model MB704LL firmware 05.12.01. I haven't had the need to upgrade but, now that more software is 4.0+ I feel its time.

    Any advice on upgrading to 4.1 ONLY and then JB?


  • Lavender

    They want to be ABLE to lock down their phone, because – yes – they do get kickbacks from phone companies around the world.

  • Jorge

    What about all these websites that offer to unlock the iPhone 4 3GS. Etc running on 4.1 are they really able to unlock the 02.10.04 firmware ????

  • Jorge

    How did you unlocked they phone?? What is the website and would it work with iPhones locked to at&t??

  • KooMoo

    Its a scam for credit info if anything they get there same sources from dev team n others that help with jailbreak n unlocking… Don't buy anything if u want to help just donate to dev team

  • unreal

    land of the free…

    My non-US iphone was unlocked by the carrier upon request (and there are multiple carriers)

    In a junk drawer, i have an AT&T locked non-subsidized 3GS. I feel like returning it to steve, personally, at very high velocity. (to be fair, i used to SW unlock it, but traveling with such a hacked phone can leave you screwed)

    Anyone remember the infamous 1984 commercial and sense the irony?

    Or maybe not. Since Apple doesn't allow irony apps on their app store.

  • I found a step by step guide that helped my Jailbreak my iPhone4

  • iUrAs

    Use PwnageTools 4.1.2 or SnowBreeze 2.0 to upgrade / jailbreak to iOS 4.1 as these tools will preserve your 05.12 baseband.

  • Lavender

    Irony. It's quite amazing how desperately Apple wants be to go to the Android path when it comes to upgrade my iphone3gs.

  • Lavender

    nb – I habe a blog doze and ab sbelling "me" as "be".

  • mc

    I updated my un-jailbroken iphone 3GS to 4.2.1 and got stuck in recovery mode. Because I had used my laptop to jailbreak other iphones my windows host file had some entries that were blocking apple servers ''.

    I had to use Recboot to break out of recovery mode then comment out in my hosts to successfully upgrade.

    just be aware that jailbreaking tools edit your host files and in future can brick your iphone if yo try to upgrade.

  • manny fresh

    i upgraded my 3g 3.1.3 to 4.2.1 with redsn0w and everything seems fine. Everything seems to be running allot smother and i love the new features

  • fas

    I am starting to hate Apple for their user unfriendlyness.

  • h2o2h

    I hated them for a while now. I think if people like use are heard and stop buying into their BS, maybe their depleting pockets would stimulate "change." As long as they keep selling, we mean nothing.

  • TM shyam

    good news guyz,,, keep it up..

  • zebcreed

    Come on Apple leave us alone. Are we that big of a threat? Why alienate your biggest fans?!?!

  • Enoch

    Sod the unlock, i want an un-tethered jb 🙂

  • divious

    the dev team isnt working on the 4.1 they are working on 4.2.1. and it will be released Sunday so you might as well upgrade to the 4.2.1 i know it sounds funny but it true go read it on

  • Unjailbhroken 3GS Locked/iPhone4 jailbroken Fac-Unlock

    1. Guys, technically… does an unlock (ultrasnow)purpose have any kind of bearing if u do not wish to change/shift your carrier but jst want ur iPhone Jailbroken? & after w/c, a later version goes out & u just wish to upgrade & rejailbreak again? Any complications w/ that?
    2.Assuming you have a fac-unlock iPhone, jailbroken state, & wish to upgrade to the most current iOS version… does it involve any kind of hazard if u simply upgrade & use appropriate JB tool not considering whether ur BB increments as well?
    Thanks very much! Just need technical infos to get enlightened w/ the JB/Unlock world. 🙂