iPhone 4 Baseband Chip Replacement

Discussion in 'Jailbreaks and iOS Hacks' started by moonchilddave, Mar 2, 2013.

  1. moonchilddave, Mar 2, 2013
    Last edited: Mar 2, 2013

    moonchilddave macrumors regular

    Sep 21, 2009
    I have a friend who managed to screw up their iPhone 4. I think they may have managed to flash it with a 3GS ipsw bundle. I've tried just about everything to get it working again. According to her it came on iOS 6.1 and she was able to use it with WiFi to download apps and such (it wasn't jailbroken). She then tried to jailbreak it, and it's never been the same.

    It has no IMEI, bluetooth, or WiFi now despite all my trying. She said she tried to jailbreak it the same way she did with her 3GS, but with a newer version of redsn0w. When I asked if she downloaded the proper IPSW - she didn't know, so I'm guessing not.

    I've managed to get it on iOS 6.1.2 with a tethered jailbreak using redsn0w 9.15b3 but all comm services are gone. I noticed that it had SHSH blobs for 4.3.3 thru 4.3.5 and 6.1.2. Also, the latest Tiny Umbrella (6.1.2) reports the phone model as: "MC608LL/A - INVALID" which seems odd to me.

    From redsn0w's identify:

    ActiveWirelessTechnology:        kCTWirelessTechnologyUnknown
    BasebandMasterKeyHash:           UNAVAILABLE
    BasebandStatus:                  BBNotReady
    BasebandThumbprint:              UNAVAILABLE
    BluetoothAddress:                00:00:00:00:00:00
    FirmwareVersion:                 iBoot-1537.9.55
    ProductType:                     iPhone3,1
    ProductVersion:                  6.1.2
    WiFiAddress:                     00:00:00:00:00:00
    Would this be indicative of a shot baseband that can't be fixed via software?

    If that's the case, is replacing the BB chip a big deal? And where would I find the chip for purchase? I found this article that has a detailed procedure for the 4S - I assume the 4 is pretty much the same? And is the baseband chip the only part that would need replaced?


    Any help would be greatly appreciated.
  2. dictoresno macrumors 601


    Apr 30, 2012
    dont know how to really help you. however i was under the impression that any kind of PCB, especially the processor or babseband chips cannot be found anywhere other than from another donor phone. when i used to repair blackberry phones for friends, i was never able to find new circuit boards online anywhere. as far as i know, you can only source them from apple. the phone may be fried now and buying a new one may only be the way out of this one. even if you could buy a new PCB, it would probably cost more and be harder to come by than a used iphone 4.
  3. moonchilddave thread starter macrumors regular

    Sep 21, 2009
    They're $20 here supposedly:

  4. dictoresno macrumors 601


    Apr 30, 2012
    You realize that would probably require some supreme soldering skills right? And my guys is you would either burn the board and ruin the whe project or somehow kill the traces that lead to it. That's awfully intricate work and my money would be on you not getting it to work.

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