Results 1 to 2 of 2

Your favorite Apple, iPhone, iPad, iOS, Jailbreak, and Cydia site.

Thread: 3G FW:3.1.2 - 4.1 Upgrade

  1. #1
    Default 3G FW:3.1.2 - 4.1 Upgrade

    I have a 3G iPhone as follows...

    FW 3.1.2 (7D11)
    Model MB704LL
    16 Gig
    Modem Firmware 05.11.07

    I want to upgrade and jailbreak it to 4.1 software. Right now I have the current 3.1.2 software already jailbroken with redsnow and the unlocked with

    I have tried to upgrade to 4.0, 4.01, 4.1 but iTunes 10 won't let me use a CFW. I tried restoring to the original 3.1.2 FW and iTunes won't let me do that either, same erros, 21, or 1604. Every time I try I get a 21 error or a 1604 or something else.

    So, I would like to know if one of the experts here can tell me how to do it. I have tried many tutorials from here, there... no success. I tried making a CFW with SnowbreeZe 2.01, 2,02, using iReb 4.xx, still doesn't work, iTunes just gives me the can't upgrade errors. I have tried using redsn0w 0.9.5b5-5 and it accepts the FW iPhone1_2_4.0_8A293_Restore_3.ipsw, starts up, goes through all the motions, SEEMS to act like it's upgrading my phone but when I turn it on it is still 3.1.2 (7D11) in my about settings on the phone.

    I used these FW's to try to restore with iTunes...

    When I tried to restore the FW version... iPhone1_2_4.0_8A293_Restore_3.ipsw

    iTunes said "iTunes will erase and restore and verify the restore with Apple"... but I am worried if I do that my baseband will be updated and I'm shot and can't unlock or JB, is that right?. And when I tried to restore the original FW to start from scratch I got 1604 or 21 errors.

    Any ideas? I'm kind of stuck at the moment and paranoid I will brick my phone.


  2. #2
    Retired Moderator iYeow's Avatar
    Join Date
    Feb 2008
    Vancouver, Canada
    Thanked 2,764 Times in 2,652 Posts

    Wow, you are applying any tools that you can think of. You must know what you are doing.
    Are you serious, you unlock with, you unlock with Ultrasn0w.
    Do a restore again to 3.1.2 by doing the shift + Restore .
    I don't think you are going to get error 1015, but if you do , then use kick out of recovery from Tiny Umbrella.
    Jailbreak again with Redsn0w 0.9.4
    Update Cydia
    Now put your iphone into Recovery mode
    Do the Shift + Restore to Custom firmware 4.1 created by Snowbreeze 2.0.2

Posting Permissions
  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts