How to upgrade iPhone 3G/3Gs to 06.15.00 baseband using Redsn0w

As we announced yesterday, you can now unlock on firmware 4.2.1 on iPhone and , please notice that this is not for iPhone4, updating your to 06.15.00 on your iPhone4 would be pointless so please don't do it. There are certain risks involved with updating your to 06.15.00. You may void any warranty due to upgrade or miss critical upgrades for your as they are released by Apple. There is no way to hide your . After the upgrade , you cannot restore an earlier by any means.

This tutorial will walk you through update to 06.15.00 baseband using Redsn0w.

redsn0w 0.9.6b6 - Mac OSX
redsn0w 0.9.6b6 - Windows

Step-by-Step Guide to Upgrade Baseband 06.15.00 :

1. Download iOS 4.2.1 .ipsw files for your iphone 3GS 3G
2. Download and install latest version of iTunes 10.1 on your computer . Update your device to iOS 4.2.1 downloaded in Step 1
3. Download RedSn0w 0.9.6b5 from the links above.
4. Now launch RedSnow 0.9.6b5 and browse the ios 4.2.1 .ipsw file you just downloaded.

5. Next step is where RedSn0w identifies the .ipsw and prepares for jailbreaking your device.
6. Now you will be shown the screen where you have to make choices . Select “Install Cydia” & “Install Ipad Baseband

7. Next you must connect your device to the computer. Make sure its turned off before you click on Next .
8. Now you must enter DFU mode. [ How-to enter DFU Mode ]. Follow on-screen instructions to put your device in the DFU mode by holding the Home and Power button together for 10 seconds. Release the Power button while still holding the Home button .
9. Now RedSn0w will start jailbreaking your phone and when it's done you will be on the 06.15.00 iPad baseband.

You can now unlock your device using Ultrasn0w 1.2, click here for a tutorial on how to do that

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  • dristy

    Is there any ways to unlock for those who got the iphone comes with 4.2.1 ios. I have already successfully jailbreak my device with greenpoison RC5 and it’s works magically on it’s first attempt. But I can’t unlock my phone for that I may able to use any carriers sim. Is there any hope that the unlock software will released in future???

    • thescragster

      Hi mate,

      Do you have an iPhone 3GS or iPhone 4? If you have an iPhone 3GS you can update your baseband to the iPad baseband (06.15) and then unlock using Ultrasn0w. Click here to follow that tutorial.

      If you have an iPhone 4, at the moment you will not be able to unlock. An unlock for those iPhone 4 basebands is expected sometime after iOS 4.3 is released by Apple.

      Hope that helps :)

      • BRICK

        use 0.9.6 b5

  • Jughead

    Ok, starting to assume its not possible. A friend gave me an original iphone its on 4.2 with bb 5.15.4 i believe it maybe 5.14.4..sorry its in dfu mode at the moment. Ive used redsnow .096b6 using the 4.2 ipsw and selected the ipad baseband change so that i can unlock it. It gets to a point where it says waiting on reboot and just hangs.

    should i give up?


    • JaeM1llz

      By original iPhone do you mean 2G? As far as I know the iPad baseband only works on 3G and 3Gs iPhones, so if you have the 2G you might be stuck until the new unlock comes out.

  • Tonychan

    Need help! I updated an iPad firmware and installed Cydia successful but message said it is tether jailbreak. Then i try to install the GreenPoison on it. but now I got nothing in my home screen on iphone. The phone booted up but I can’t do anything because there is no app even apple original app. Does anyone know about it? Please help me, thanks! Yes, this is my first time to unlock my iphone.

    • JaeM1llz

      What firmware are you on? Greenpois0n only works for 4.1 and 4.2.1, if you are on the 4.3.1 you will have to wait until midnight tonight(April 3rd) Pacific Standard time for an untethered jailbreak. Let us know!

      • Tonychan

        i’m on 4.2.1. thank you! the thing is now i have none of apps even the default apps come with the phone.

  • Tonychan

    I’m on 4.2.1 with iPad BB 06.15.00. But I went to Setting—-> General —> Reset —-> Erase all Content and Settings…to delete my information. Now everything is gone. All apps are gone even the default apps from apple. I only could power on the iPhone but nothing is in there, no phone app, no iTunes app, no apple store, no weather, no stock, no calendar, no message, no photos, no maps, etc. It means everything is gone now. Please help! I can’t update to 4.3.1 because i’m on iPad BB 06.15.00. Greenpois0n is in there because i see the logo when start up. but at home screen is completely nothing.

    • JaeM1llz

      Sounds like you’re gonna have to do a fresh restore. You can still update with the 06.15.00 baseband, you just have to do it in Pwned DFU mode with a pre-jailbroken firmware using Tiny TSS Server to bypass the Apple activation servers. As long as you have your SHSH you will still be able to restore 4.2.1

      • Tonychan

        I just want to have all my default apps back as original. I really don’t know much about the iPhone. It is my first time to unlock it myself also. But u said about a fresh restore, how can i do that? how can i do Tiny TSS Server to bypass the apple activation servers? can u show me the way? thank!

        • JaeM1llz

          Download Tiny Umbrella from here and connect your device and click “Save SHSH” check to make sure your 4.2.1 SHSH is saved, that’s the first step, if you don’t have that you won’t be able to restore 4.2.1

          • Tonychan

            haha! that’s one is for iPhone 4 but I have iPhone 3GS. Can I update my 3GS from 4.2.1 BB 06.15.00 to 4.3.1 with Tiny Umbrella ? can I do that?

          • JaeM1llz

            Yes, just hit Start Tiny TSS server and then open iTunes and hit “restore”

  • Tonychan

    Thank you so much! I will try to restore it and will let u know if it has been successful or not or fix my problem or not.

    • Nalam

      Hi Tonychan,

      Did you update your 3gs from 4.2.1 BB 06.15.00 to 4.3.1 ? is it working ?

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  • br

    got iphone3g on ios4.2.1 and cant update to 06.15.. keeps sayin it ‘cant fetch ipad baseband, check internet connection’.. but connection’s pliiiiiiiiiiiiz

  • wax

    I have an iphone 3g(s) with supporting firmware of 4.2.1…i’m not able to unlock it because it has a NEWER BOOTROM ….
    i have tried to unlock, jailbreak it with redsn0w_win_0.9.6b6(enabled cydia & ipad baseband) but it says newer bootrom(SERIES NO.)
    how can i unlock it?????

    • JaeM1llz

      When you first load the 4.2.1 firmware into Redsn0w a popup will come up that asks you if you have the newer iPhone 3Gs or older, you must tell it that you have the newer one or the iPad baseband will not work

  • SDO

    Does anyone know if there’s another way to get my GSM signal of my 3GS working? Got it at 5.16.xx. Firmware is 4.3.3. Dont feel like losing my GPS function to be honest.

    • JaeM1llz

      There is no other way to unlock 05.16.

      • SDO

        Ah ok. Well thanks. I’ll just upgrade the baseband then and take the risk.

  • Maxvot

    I have some odd situation at my end. I have iPhone 3G wich was jailbreaked and unlocked with ultrasonw. Accidentally, I upgraded my Modem Firmware to 5.14.02 & version is 4.1 (8B117). Fortunately my service provider allowed me to get on to network. I dont know how, may be in my country (India) now we have oficial unlocked iphones.

    Now my question is, since we can use official unlock phones in India. If I upgrade my iPhone 3g to 4.2 version through with my itunes. Will it work ? Cause I have no clue about what firm ware I would be getting.

    The reason I need to upgrade to 4.2 is that, I dont see many facilities in my phone right now. e.g. Setting up fonts for notes. Multitasking. Home screen and lock screen option etc.

    Please suggest or help.

    • JaeM1llz

      If your phone is factory unlocked it will work on any firmware regardless of the baseband.

  • Rodders

    A bit lost really. I was setting my 3G back to factory settings after getting a new phone. And followed these instructions to the letter other than using RedSn0w 0.9.9b6. (does this make a difference???) and it all seems to work fine but eventually when the phone restarts it keeps asking me to plug in into iTunes. And iTunes just says “iTunes has detected an iPhone in recovery mode. You must restore this iPhone before it can be used with iTunes.”

    How do I get past this??????

  • Michelle Vaske

    thank you!!  finally got my phone unlocked using this tuto and redsn0w 0.9.9b6, I was using the latest version and it kept crashing.  curious to see how my gps faired…

  • Cokirix_

    awesome guide, it works so well! keep up the good works you guys are awesome

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