Jailbreak 4.2.1 iOS & Update 05.14.02 & 05.15.04 to 06.15.00 with Redsn0w 0.9.6b5

Posted by | November 30, 2010 | Hacks, How to | 8 Comments

iPhone Dev Team’s ultrasn0w 1.2 works well to unlock iPhone 3GS & 3G 4.2.1 if they’re on baseband 06.15.00. You should jailbreak 4.2.1 & update 05.14.02 or 05.15.04 to 06.15.00 baseband in order to get iOS 4.2.1 unlock for 3G and 3GS iPhone versions. We’ve already posted a PwnageTool tutorial for those who want to use PwnageTool 4.1.3 (Mac only). Here is our guide for those Windows and Mac users who want to use redsn0w 0.9.6 Beta 5 to jailbreak and update iPhone 3G and 3GS baseband to 06.15.00:

Before you Begin:

Download iOS 4.2.1 firmware and update iPhone to iOS 4.2.1

Download Redsn0w 0.9.6 Beta 5 [Windows | Mac]

Step 1: Launch Redsn0w, click on “Browse” and select the downloaded iOS 4.2.1.

11-redsn0w-browse-firmware

Step 2: 3GS users, Redsn0w will show a dialog box asking if you have new bootrom or old one. Click “Yes” if you have new bootrom iPhone 3GS and click “No” if you have old bootrom version.

12-redsn0w-new-bootrom

Step 3: Redsn0w will show the following options:

  • Install Cydia
  • Install custom bundle
  • Install iPad baseband
  • Just boot tethered right now
  • Just enter pwned DFU mode right now

Select “Install Cydia”, that’s obvious of all. Also select “Install iPad baseband” if (and only if) you want to unlock iPhone 3GS or 3G 4.2.1 iOS with ultrasn0w 1.2.

14-redsn0w-options

Be sure to read the warning that redsn0w shows when you check the “Install iPad baseband” checkbox.

13-redsn0w-baseband-update-warning

Step 4: In next step, connect your device to computer while it’s turned off. Then click “Next”. Be ready to perform some quick actions to enter DFU mode.

Step 5: Enter DFU mode, follow on-screen instructions that redsn0w shows.

15-redsn0w-dfu-mode

Soon as your device gets into DFU mode, redsn0w will begin the jailbreak process and will also update 05.15.04 to 06.15.00 baseband in the process.

iPhone 3GS, 3G Unlock iOS 4.2.1

After jailbreaking and updating the baseband, iPhone 3G and 3GS users can follow our guide on how to unlock iOS 4.2.1 with ultrasn0w 1.2.

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  • threeeye
    2G = worked fine !
    3GS = the Cydia icon is white, and can’t load.

    can anyone help ?

  • 3gs
    I have same problem with 3gs white icon and wont load
  • Dazzie
    Hi Guys.
    Help needed please! Going out of my mind with all this but wont let it beat me! I wish to unlock my iphone 3G and as I understand it first I must jailbreak it….along comes this great program ‘redsn0w’ that promises to do both! I go thru the motions and all is good till the ‘waiting to process’ screne where it all comes to a stop!?! I then discover that I may have to upgrade the baseband to 06.15 from 4.2.1 (when I’ve already done this from 4.1)!? Advice pease :-( (
  • Mark
    06.15 baseband is not the same as ios 4.2.1
  • Naif
    Do i need to update baseband if my iphone 3gs is factory unlocked?
  • Just Helping
    For anyone who is having issues opening Cydia after the jailbreak; you must RE-OPEN redsn0w, select your IPSW again, go next to the “select options” area, UNSELECT “install cydia” and SELECT “Just boot tethered right now”.

    This should be done after jailbreaking AND anytime changes are made using Cydia.

  • Mike
    HI guys I ran the program like you instructed and every thing worked perfectly, Jailbreak and upgraded the base band to 06.15. successful, however, I’ve noticed that when I click on sounds in the general tab it throws me back to the main screen. Do I need to install something more to get this to work?