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Thread: Downgrading iPhone 4 from iOS 5 to 4.3.5 (Error 1604)

  1. #1
    Default Downgrading iPhone 4 from iOS 5 to 4.3.5 (Error 1604)
    I upgraded my iphone from 4.3.3 to iOS 5 Beta 6 just to give it a try (as a developer), however I prefer version 4.3.3, I am aware that downgrading from iOS 5 to 4.3.3 is almost impossible unless I have my SHSH blob (which I don't) so I'm trying to downgrade to 4.3.5 instead. I put my iPhone in DFU mode and restore it but it gets stuck on Preparing iPhone to restore and after 5 - 10 min it gives me an error 1604. I tried downgrading my iTunes to 4.1 and 3.1 and it doesn't work with either. What can I do?

    Thanks

  2. #2

  3. #3
    Absolutely the same problem, step by step. The only exception is that i have saved SHSH files all the way from 4.3.1 to 4.3.5

    And I still can restore to iOS 5 beta 6.

  4. #4
    Superbad Modder-ator Simon's Avatar
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    Quote Originally Posted by shitmix View Post
    Absolutely the same problem, step by step. The only exception is that i have saved SHSH files all the way from 4.3.1 to 4.3.5
    In that case you can try entering pwned DFU and restoring to a custom 4.3.3 made with pwnage tool or snowbreeze.

  5. #5
    I read somewhere that could be the issue, I haven't tried it in another computer yet, but why could that be the problem? I'm trying it today though.

  6. #6
    Superbad Modder-ator Simon's Avatar
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    Quote Originally Posted by robinenrique View Post
    I read somewhere that could be the issue, I haven't tried it in another computer yet, but why could that be the problem? I'm trying it today though.
    TBH that error is a weird one. Not quite sure what causes it but most times people have success getting around it by using another computer or uninstalling itunes completely and reinstalling it.

  7. #7
    Quote Originally Posted by Simon View Post
    In that case you can try entering pwned DFU and restoring to a custom 4.3.3 made with pwnage tool or snowbreeze.
    Thanks for the advice. I'll give it a try and will share the result. I have never tried a custom IPSW though - I hope that I will be able to put a stock one in the future...

    I forgot to mention, but maybe it is important - I'm trying all this since iOS 5 crashed and put my iPhone into recovery mode.
    I'm restoring back to iOS 5 beta 6 and will try to downgrade from this state.
    Last edited by shitmix; 08-29-2011 at 02:49 PM.

  8. #8
    I will try it in another computer and tell you about it, but I'm pretty sure it won't work , I tried uninstalling iTunes three times and even downgraded it without success.. I will let you know if it works.

    Another question, assuming it does work, would I downgrade basebands as well doing so?

  9. #9
    Superbad Modder-ator Simon's Avatar
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    On a iPhone 4 yes your baseband will be downgraded back to the 4.3.5 baseband (4.10.01 I believe).

    At least as long as Apple is still signing 4.3.5

  10. #10
    Quote Originally Posted by Simon View Post
    TBH that error is a weird one. Not quite sure what causes it but most times people have success getting around it by using another computer or uninstalling itunes completely and reinstalling it.
    Tried in another computer and didn't work.

    I'm getting pretty tired of this, any other ideas?

  11. #11
    Young Gun iJasonTATE's Avatar
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    I had this issue about a week ago with my iPad and downgrading from iOS 5 b6 to 4.3.3 (with blobs). This is a bit of a different scenario than yours but I got the same error, 1604. So all I did was downloaded iTunes 10.3 and I restored fine back to 4.3.3. I see that you have already tried downgrading your iTunes without success. This is a very interesting case. I'm going to do some research.

    -Jason
    iPhone 4S | MacBook Air

  12. #12
    Quote Originally Posted by iJasonTATE View Post
    I had this issue about a week ago with my iPad and downgrading from iOS 5 b6 to 4.3.3 (with blobs). This is a bit of a different scenario than yours but I got the same error, 1604. So all I did was downloaded iTunes 10.3 and I restored fine back to 4.3.3. I see that you have already tried downgrading your iTunes without success. This is a very interesting case. I'm going to do some research.

    -Jason

    Yes. Things I've tried so far:

    (I am right now in a recovery loop)

    - Tried with iTunes 5.0, 4.1 and 3.1 without success.
    - Tried with another computer, tried with another user account and disabled firewalls.
    - Killed iTunes process on task manager once the error was shown and re run iTunes. (read it somewhere)

    All that I've left to try out is to restore without shift + restore on iTunes (updating with iTunes directly) and to run the update directly from windows folder (AppData - Apple iPhone Update, but I can't find it anywhere in windows 7)

  13. #13
    Young Gun iJasonTATE's Avatar
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    On Windows XP :
    Documents and Settings\<User>\Application Data\Apple Computer\iTunes\iPhone Software Updates

    On Windows Vista/Windows 7:
    Users\<User>\AppData\Roaming\Apple Computer\iTunes\iPhone Software Updates

    On Mac:
    ~/Library/iTunes/iPhone Software Updates

    This were the folders should be located on Windows XP, Vista, 7, and Mac OS X. Hope this helps.

    -Jason
    iPhone 4S | MacBook Air

  14. #14
    Quote Originally Posted by iJasonTATE View Post
    On Windows XP :
    Documents and Settings\<User>\Application Data\Apple Computer\iTunes\iPhone Software Updates

    On Windows Vista/Windows 7:
    Users\<User>\AppData\Roaming\Apple Computer\iTunes\iPhone Software Updates

    On Mac:
    ~/Library/iTunes/iPhone Software Updates

    This were the folders should be located on Windows XP, Vista, 7, and Mac OS X. Hope this helps.

    -Jason
    Thanks Jason,

    Found the folder but there isn't any iPhone Software Updates available in it.

    I'm trying to download it directly from iTunes and restore it without shift + restore, I don't know if that could make any difference, I guess not.

    Another thing, I had my AT&T sim card the whole time, I don't know it that could make any difference at all. Can't try it right now, though, cause I'm downloading the update from iTunes
    Last edited by robinenrique; 08-30-2011 at 12:39 PM.

  15. #15
    Young Gun iJasonTATE's Avatar
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    Okay, let me know how it goes after the update completes.

    -Jason
    iPhone 4S | MacBook Air

  16. #16
    Quote Originally Posted by iJasonTATE View Post
    Okay, let me know how it goes after the update completes.

    -Jason
    Didn't work. I can restore to iOS 5 without any problems, but can't restore to 4.3.5. Still getting error 1604.

  17. #17
    Super Moderator iYeow's Avatar
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    When you restore to 4.3.5, did you put your iphone into dfu mode ?

  18. #18
    Young Gun iJasonTATE's Avatar
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    Quote Originally Posted by iYeow View Post
    When you restore to 4.3.5, did you put your iphone into dfu mode ?
    He did and e is still receiving this error from iTunes.
    iPhone 4S | MacBook Air

  19. #19
    Super Moderator iYeow's Avatar
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    I have a feeling it has something to do with the itunes version. Itunes 10.2 should be the one for 4.3.5 restore. Error 1604 also means it cannot verify its blob.

  20. #20
    Do I need blob for 4.3.5?

    I will try with iTunes 10.2, I'm also going to downgrade first to iOS 5 Beta 1 and then downgrade to 4.3.5 to see if its possible..

    Also, everytime I restore to iOS 5 Beta 6 and then try to downgrade to 4.3.5 I get into a recovery mode loop..

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