Couple of redsn0w questions

Discussion in 'Jailbreaks and iOS Hacks' started by buckyballs, Sep 6, 2009.

  1. buckyballs macrumors regular

    Joined:
    Dec 22, 2006
    #1
    Hey guys, noobie here :)

    I'm planning on jailbreaking (not unlocking!) my iPhone 3G, but can I check that I've got a few things correct?

    1) Redsn0w does not touch the baseband and only fiddles with the other files, so can be completely undone by restoring via iTunes/Xcode

    2) You can't brick the iPhone with redsn0w, just with ultrasn0w (which I don't need to use since I don't want to unlock)

    3) Once unlocked, the phone will still work fine with iTunes/Xcode for transferring media/deploying apps

    Thanks!
     
  2. -Ryan- macrumors 68000

    Joined:
    Jan 28, 2009
  3. wRek macrumors member

    Joined:
    Sep 6, 2009
    Location:
    WA state.
    #3
    Yep! Just did the process this morning. Everything is fully functioning just as before.:) Only better.
     
  4. buckyballs thread starter macrumors regular

    Joined:
    Dec 22, 2006
    #4
    I've just watched a video of a jailbreak and it comes up saying "Flashing NOR". What exactly does this mean? The word "flashing" usually causes alarm bells to ring when I'm hacking something. I'm a computer science student, so it's ok if you get technical in your explanation :)
     
  5. thelatinist macrumors 603

    thelatinist

    Joined:
    Aug 15, 2009
    Location:
    Connecticut, USA
    #5
    One of the iPhone's bootloaders is stored in its NOR flash memory, and that bootloader must be replaced with a modified version in order to boot the modified kernel that eliminates the chroot jail. During the jailbreaking process, redsn0w overwrites parts of the NOR memory, "flashing" it. You don't need to worry about this too much; if something goes wrong in the process, you can restore in DFU mode (which does not rely on this secondary bootloader) and it'll be good as new.
     
  6. buckyballs thread starter macrumors regular

    Joined:
    Dec 22, 2006
    #6
    Oh, so that's how it fiddles with the bootloader

    So this memory can be erased and modified easily (unlike the baseband, which can't be fiddled with unless it's an upgrade)?
     
  7. thelatinist macrumors 603

    thelatinist

    Joined:
    Aug 15, 2009
    Location:
    Connecticut, USA
    #7
    I wouldn't exactly say easily; it took the Dev Team months just to figure out how to dump it, originally. But the procedure has been working well for some time.

    I applaud you for taking the time to do the research and understand the process of jailbreaking. Since you seem to need reassurance, though, I will say that I have never heard of an iPhone being bricked since version 1.1 of the firmware implemented the DFU mode (which bypasses the bootloader). Literally millions of people have jailbroken their phones without any permanent damage. The worst that can really happen is that you have to do a DFU restore.
     
  8. buckyballs thread starter macrumors regular

    Joined:
    Dec 22, 2006

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