Things to Consider Before Upgrading to iPad’s Baseband 6.15.00

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When the iPhone 3G and 3GS ultrasn0w carrier unlock came out 2 weeks ago, it made everyone excited and liberated thousands or probably millions of iPhones.

UPDATE: Forget about installing iPad baseband on your iPhone, make it officially unlocked without hacking or jailbreaking here.

Everyone knows that it was made possible through the use of iPad’s baseband version 6.15.00. iPhone 3G and 3GS’ original basebands 5.14.02 and 5.15.04 were left in the dark, and probably can never be unlocked, ever.

Editor's note: learn more by reading our ebook on starting your own iPhone repair & unlock business

So, if you plan to implant iPad’s baseband 6.15.00 into your iPhone 3G or 3GS, you may want to read and consider the following:

  1. There is no software downgrade procedure available once your baseband has been upgraded to 6.15.00. However, @MuscleNerd is currently working on this.
  2. If you have a baseband 6.15.00, you will NOT be able to restore using the original firmware. That means iTunes will give you an error message if you try to restore it directly from there. You can only do it via a custom or ‘cooked’ firmware created with redsn0w or other tools such as sn0wbreeze.
  3. GPS will not work properly (or not working at all!) on your iPhone due to this baseband although a fix is said to be on the horizon.
  4. You will void any Apple warranties as they can easily detect this baseband if you bring it in for service.
  5. The resale value of your iPhone may be lesser due to the above, that’s if you intend to sell it at one point. Otherwise, this is not really an issue.
  6. UPDATE: iPhone 3GS produced after week 28 of year 2011 is not compatible with iPad baseband. Read here.

If these do not bother you at all then you are ready to unlock your iPhone. You can follow the steps here. Alternatively, we provide hardware unlock by replacing the baseband chip which contains iPhone’s original baseband 5.13.04 which is already unlockable. This will eliminate most of the issues above.

Things to Consider Before Upgrading to iPad’s Baseband 6.15.00 was last modified: May 27th, 2013 by Jonathan

Comments & Discussion

  1. A couple of weeks ago my brother gave me his old iPhone 3gs. It was unlocked and running 4.3.3
    I was dumb and upgraded it to 5.01 in itunes, and got one of the unlockable basebands.
    I then installed a custom firmware running iOS 5.0 and the iPad baseband.
    Problem is that it's a bit bugged and it has rather bad reception and sometimes it restarts when I try to send sms.

    I'm considering reinstalling the OS on it, but I'm not sure if I should use 5.0 or 5.0.1.
    Any suggestions?
    How do I do this? What's the best software to use for it? Is there some step by step tutorial for it somewhere?

  2. Is it possible to unlock an Iphone 3gs, iOS 4.1, BaseBand(modem firmware) 05.16.05, Model MC136LL? Week 50 according to serial number.

    It says on various sites that I should change the base band to the ipad base band but on several sites is says not too because I have the model number MC136LL and that it could brick my phone or worse. Is there another way?

    Thank you for any help! I hate to bother, but I've been at this for hours (successfully jailbroke!) and am stuck on this last part…

  3. I have an iphong 3gs 8gb
    Model introduced: 2009
    Production year: 2011
    Production week: 38 (September)
    Production number: 7194 (within this week)

    Are there any possible solution to unlock the unit? If not now, how soon it is to have? Thanks

  4. Hi,

    I have a 3GS, IOS 5.0.1 ipad baseband. Its keep showing no service. I have used ultrasnow 1.2.5 but still am unable to get any service. Please advice if there is any solution or are you able to fix the issue.

    I also have another 3GS, IOS 5.0.1 baseband 05.16.05. This iphone has always been working fine but i havent used it for months as i bought an Iphone 4. My Iphone 4 had some issue and i send it for repair. Thought of using the 3GS as a replacement phone while my Iphone is being fixed. But it shows no service. Brought to a repair shop, the guy says my baseband chip has ‘burnt’. Please advice if there is any solution or are you able to fix the issue.


  5. where can i get to download this file please 4.2.1 (3GS): iPhone2,1_4.2.1_8C148a4.2.1Custom_Restore.ipsw as have try this site is not going (megaupload) please help me out. or could some one please send it to my mail please please pleassssssssssssssssss.

  6. I have a 3gs now 5.0.1 it came unlocked but after hailbreak on 5.0.1 custom it locked on 1 carrier bb 15.16.5 any help on this?

    Also now i have no audio unless i use earbuds please help me finf a solution to this

  7. I have an iPhone 3gs that I recently bought that is locked to AT&T. Its current Modem Firmware is 05.16.05 and software version is 5.0.1. Therefore, it is virtually unlockable unless I change the firmware to that of the iPad (06.15.00). I do want to unlock my iPhone but not to an extent where i will be risking its features. For example, I do not plan to use the data on it so it will not matter if that breaks nor will I care if apple finds out but I would like to still have the wifi intact and not have too many complications with it.

    Is it a good idea to change the firmware in my phone? Will I be unable to use my wifi? Is there a way to revert if it does turn out screwed up?

  8. So I bought an unlocked 3GS about two weeks ago. Not knowing it was unlocked, I upgraded the OS and, not knowing about this baseband issue, I jailbroke, upgraded baseband to 06.15.00, and unlocked using ultrasn0w. It worked, so when I found out about this issue, I assumed my phone was produced before the 28th week.

    Well two days ago it stopped working…lost data connection and no matter what I tried I couldn't fix it. I upgraded to 5.1, but nothing has changed. I looked up the serial number, and discovered it was produced on the 46th week…So why did it work for the past two weeks? I'm so confused. Now no matter what I do, it won't get the signal back.

    Any ideas? Any idea why it worked for a while?

    Also, it DOES in fact let me install the stock software thru iTunes. Why?

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