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Discuss [Bootloader] Anyway to downgrade from 4.6 to 3.9? at the iPhone "2G" (Rev. 1) - Hackint0sh.org; int Checksum(CmdHeader * packet) { int sum = 0x00030000; sum += packet->opcode; sum += packet->param_len; ...
  1. #81
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    int Checksum(CmdHeader * packet)
    {
    int sum = 0x00030000;
    sum += packet->opcode;
    sum += packet->param_len;

    int len = packet->param_len;

    // This pointer will start at the beginning of packet which includes opcode and param_len
    unsigned char * buf = ((unsigned char *)packet) + sizeof (CmdHeader);
    int i = 0;

    // This will add all bytes in packet. Since you already add opcode and param_len at the start,
    // this will double-add them again
    for (i = 0; i < len; ++i)
    sum += buf[i];
    return sum;
    }
    Last edited by HarryP; 11-22-2007 at 07:44 AM. Reason: Error


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    If I look at the documentation of Papua dealing with S-Gold platform then I am not very enthusiastic regarding flashing the bootloader:

    "IMEI involved in kriptovanii and is present in 52, 76, 5008, 5009, 5077, 5121, 5123 block of EEPROM, as well as established and BCORE area."

    (BCORE=BOOTLOADER)


    If the IMEI is any way stored/involved in the bootloader then one would know the methods to restore the IMEI ...

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    Senior Professional Array duwde's Avatar

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    To those that is using IDA and bbupdater, you need to use a patched macho.ldw (look at dev-team page at http://iphone.fiveforty.net/wiki/index.php/Disassembly)

    The link to rapidhsare on dev-team page seems to be down ate the moment (hardware problems at **********), So I've patched myself the macho.ldw (using dev-team page information) and uploaded the patched macho.ldw back to rapidhsare (in a working server).

    Here's the link to the patched macho.ldw to support ARM in Macho-O (IDA 5.1):
    http://**********.com/files/71420900/macho.rar
    it's from rapidhsare... you know

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    Senior Professional Array duwde's Avatar

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    I was taking a look at bbupdater with IDA 5.1 (using macho.ldw patch)...



    The "update to 1.8 or later" is referenced two times, one of them is the above image, it shows this message after 10 retries (0xA = 10 decimal), so it may be just a last message (and it really doesn't mean that much to us)...

    Pspully: did you try to flash the 3.9 bootloader on a 4.6 bootloader ? what happened ]? what message did you get from bbupdater ? what the bootloader really updated ? did it crash/bricked the iphone for good ? (well, it could do it, after all messing with bootloader isn't a good idea)... Please describe what happened...
    Last edited by duwde; 11-22-2007 at 08:47 AM.


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    maybe what I am about to say it is completely stupid....

    But, what if u tried to do the same procedures after u have downgraded fw and/or bb.

    What I am saying is that maybe the new bl is somehow "tied" to the new fw and bb. Therefore when somenone tries to load the old bl with the new fw/bb he gets an error....The fact that upgrading 1.1.1 to 1.1.2 makes it possible to have new fw with old bl does not necessarily mean it will happen the other way round.

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    Quote Originally Posted by car__34 View Post
    RUNNING NORDumper from putty after minicom -s, change from PUTTY
    It is also noted that 1.1.2 OTB has a new EEP version 208 (compared to 207) and a new EEP_revision: 1 (compared to 8).

    I guess we don't know what the EEP exactly does and how it is related to the baseband access.

    PmgR
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    "...maybe the new bl is somehow "tied" to the new fw and bb. Therefore when somenone tries to load the old bl with the new fw/bb he gets an error....The fact that upgrading 1.1.1 to 1.1.2 makes it possible to have new fw with old bl does not necessarily mean it will happen the other way round...."

    Could be...But your statement predicates on a "IF". That means it is 50/50. Would it be worth a try ? I am aware that this approach could be a dead end, however !

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    Hi PmgR

    Yeah i tried it, nothing happens man, you just get the little status ring appear on the screen and it just keeps spinning, thats it!!

    I'm gonna try 2 things today:

    1: Im gonna try and refalsh the 3.9 bootloader on a 3.9 bootloader iPhone and
    see how it does it!!

    2: If the above is successful, i will downgrade the 1.1.2 down to 1.0.2 and try it
    on that firmware!!

  10. #90
    Fry
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    Come on guysssss!
    May the Force be with you :-)


 

 

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