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Thread: Error 21 When Downgrading from Beta 3

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    Livin the iPhone Life Bernie-Mac's Avatar
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    Default Error 21 When Downgrading from Beta 3
    Hey, I keep getting iTunes error 21 when i try downgrading from 3.0 Beta 3 to 2.2.1. Ive tried using QuickPwn but it wont recognize my iPhone and i try restoring to a custom 2.2.1 but no dice. Any ideas or is Beta 3 undowngradeable?
    iLive an iLife

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    Livin the iPhone Life Bernie-Mac's Avatar
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    Quote Originally Posted by cpjr View Post
    ^Not true.

    Your supposed to get the error.

    Now hold both the home and power buttons for 15 seconds, should boot it to the lockscreen.
    Is that after I get the (21) error?
    iLive an iLife

  3. #3
    That's because your phone is stuck in testing mode. When you upgrade to 3.0, you cannot downgrade. You're stuck with it until the official
    launch of 3.0.

  4. #4
    ^Not true.

    Your supposed to get the error.

    Now hold both the home and power buttons for 15 seconds, should boot it to the lockscreen.

  5. #5
    Livin the iPhone Life Bernie-Mac's Avatar
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    Quote Originally Posted by CodyR1951 View Post
    That's because your phone is stuck in testing mode. When you upgrade to 3.0, you cannot downgrade. You're stuck with it until the official
    launch of 3.0.
    lol good one, I've downgraded both Beta 1 and 2 in the past.

    Quote Originally Posted by cpjr View Post
    ^Not true.

    Your supposed to get the error.

    Now hold both the home and power buttons for 15 seconds, should boot it to the lockscreen.
    I tried that and it just goes to the pink DFU screen.
    Last edited by Bernie-Mac; 2009-04-28 at 03:00 AM. Reason: Automerged Doublepost
    iLive an iLife

  6. #6
    PM StealthBravo, I havent played with beta 3 so thats new to me. But he should know. I know you can downgrade.

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    Retired Moderator StealthBravo's Avatar
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    I have heard more success stories with this guide. Good luck!


    Note: Your iPhone 3.0 OS backups (your phone settings, unsynched photos, text messages, etc) will not be compatible with 2.2.1 once you go back down. So make sure you have a backup from the 2.2.1 days to restore from, or else you'll be starting from scratch.

    iPhone EDGE

    If you're running OS X 10.5.6, you'll need to do the USB DFU fix outlined here before proceeding.

    1. With your phone plugged in, put it into DFU mode by holding both the power and home buttons for 10 seconds, then releasing power and continuing to hold down home until iTunes recognizes a phone in "recovery mode."

    2. Download the 2.2.1 firmware .ipsw file from Apple. Hold down option (Mac) or shift (Windows) and click on restore. Choose the stock iPhone 2.2.1 file you just downloaded.

    3. Let it do its thing, and you should be in business. Restore your backup should you have one, and proceed to jailbreaking if you want to.

    iPhone 3G

    On the iPhone 3G, the 3.0 software flashes the baseband (the chip that controls voice and data network traffic), which confuses iTunes when you try to downgrade. So you have to jump through a few more hoops to downgrade your 3G, but it's still easy enough.

    1. Follow the first two steps above for iPhone EDGE, only using the iPhone 3G 2.2.1 firmware package of course. Again, OS X 10.5.6 users will have to do the USB driver switcheroo detailed above.

    2. When it's done restoring, you'll get an error message that looks like this:



    As long as it's a four-digit error number like 10xx, don't worry, that's just iTunes telling you it's confused by the updated baseband on your phone. Everything will work fine, but unfortunately your phone will be stuck in restore mode until you jailbreak it, which is what we're doing next.

    3. For Mac (Windows users skip to step 8): Download a utility called iRecovery. This tool forces your phone to reboot out of restore mode, which is necessary for the QuickPwn jailbreak software to recognize it.

    4. Go to the terminal and change to the iRecovery directory, wherever it is on your system, and type these two commands:

    chmod 755 libusb-0.1.4.dylib
    chmod 755 iRecovery

    5. Next, copy the "libusb-0.1.4.dylib" file to the /usr/local/lib directory on your machine (you'll have to shift-command-G to go to this folder in Finder).

    6. And finally, with your iPhone plugged in, go back to Terminal and type:

    ./iRecovery -s

    You'll get a prompt, where you should then type "fsboot" (no quotes) and hit enter. If nothing happens after 10-15 seconds, type it again and hit enter again. Your phone should boot.

    7. Download QuickPwn and jailbreak your phone. Restore your 2.2.1 backup in iTunes, and you should be in business.

    8. For Windows: After you restore to 2.2.1, you can skip straight to running QuickPwn to get your phone up and running.



    via Gizmodo

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    Retired Moderator Zwayne's Avatar
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    I just went through that last night 3G on 3.0 beta3. I used pwnagetool to build a custom ipsw, and use it to put the phone in DFU mode. The screen went black then white, and black again with the apple logo with the little progress bar. It dose work.

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    Quote Originally Posted by Zwayne View Post
    I just went through that last night 3G on 3.0 beta3. I used pwnagetool to build a custom ipsw, and use it to put the phone in DFU mode. The screen went black then white, and black again with the apple logo with the little progress bar. It dose work.
    I think the most important part is getting it into DFU Mode

  11. #10
    Retired Moderator Zwayne's Avatar
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    Quote Originally Posted by StealthBravo View Post
    I think the most important part is getting it into DFU Mode
    ^+1

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