Restored iPhone 4 (iOS 4.1 -> 4.0) downgrade

Discussion in 'Jailbreaks and iOS Hacks' started by iPadThai, Jul 18, 2010.

  1. iPadThai macrumors 6502a

    Joined:
    Apr 25, 2010
    #1
    Just FYI:

    I was running iOS 4.1 since release day and since it is a beta 1, there are a few bugs that are bothering my everyday use such as:

    * MMS - images sent and received are BLACK. You can tap and hold the black image and select save, it will appear in your photos. However, if you go back into the SMS app after doing the save image feature, the app will crash and not restart (this crashing happens randomly; sometimes not at all)

    * The camera shutter lag - there is a slight >.5 second lag compared to iOS 4.0 - now it is definitely more noticeable after you snap a picture, the shutter doesn't seem to be instantaneous; but you can keep hitting the capture button and the camera will snap one image after another.

    * Baseband is updated

    * The bars (visually measuring AT&T's crappy network) is reworked but other than that, the grip of death still applies

    * Proximity sensor still is flaky even with iOS 4.1 beta 1


    So I know the JB will be released this week (don't ask me how I know) - and I needed to go back to 4.0 - I will lose the sim unlock but I am on AT&T and don't plan on selling my iPhone 4. Just a heads up for folks who have upgraded to iOS 4.1, you can just downgrade back to iOS 4.0

    Be sure to edit your /etc/hosts file to point to saurik's server. I did not back up my shsh blobs and if you don't have that gs.apple.com host line inside the host file, it won't allow you to downgrade.

    Once you have completed the RESTORE, it will error out with a 1004 error. Just use the libusb-0.1.4.dylib with iRecovery and reboot your iPHone 4 back into normal mode having iOS 4.0 fully restored.

    You can page me if you have any questions.
     
  2. mavis macrumors 68040

    mavis

    Joined:
    Jul 30, 2007
    Location:
    Tokyo, Japan
    #2
    Wirelessly posted (iPhone 4 (32GB): Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_0_1 like Mac OS X; en-us) AppleWebKit/532.9 (KHTML, like Gecko) Version/4.0.5 Mobile/8A306 Safari/6531.22.7)

    It's funny, mine didn't error out at the end. I put it into DFU mode and selected the 4.0.1 IPSW on my desktop and it worked fine. :confused:
     
  3. iPadThai thread starter macrumors 6502a

    Joined:
    Apr 25, 2010
    #3
    I did not put mine into DFU - just an Options/Restore in iTunes 9.2 on snow leopard.

    I restored back to 4.0 and not 4.0.1.
     
  4. mavis macrumors 68040

    mavis

    Joined:
    Jul 30, 2007
    Location:
    Tokyo, Japan
    #4
    Wirelessly posted (iPhone 4 (32GB): Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_0_1 like Mac OS X; en-us) AppleWebKit/532.9 (KHTML, like Gecko) Version/4.0.5 Mobile/8A306 Safari/6531.22.7)

    I see. I've got my SHSH blobs for 4.0 on file with Saurik but I didn't see the point in going back to 4.0 ... I'm sure the jailbreak will work with 4.0.1 as well, right?
     
  5. iPadThai thread starter macrumors 6502a

    Joined:
    Apr 25, 2010
    #5
    I'm not gonna take that risk of using 4.1 and getting shafted on the JB :D

    I just decided to go back to 4.0 - just in case. I'm guessing from their twitter messages that 4.0.1 is still safe. ;)
     
  6. terraphantm macrumors 68040

    Joined:
    Jun 27, 2009
    Location:
    Pennsylvania
    #6
    If you go to 4.0.1 and restore from apple's servers, your baseband will be downgraded back to 01.59.00 so you'd be able to unlock again. Right now we're unable to save the SHSH for te baseband in a usable fashion
     
  7. vinzer macrumors newbie

    Joined:
    Jun 16, 2010
    #7
    Did I miss something ? Sim Unlock ? Are we talking about iPhone 4 ? How can unlock be availalble if JB is not our yet ?

    Please explain what do you mean under:

    Thank you
     
  8. iPadThai thread starter macrumors 6502a

    Joined:
    Apr 25, 2010
    #8
    thanks for the tip! Except I just needed to UPDATE to 4.0.1 - then the baseband returned to 1.59.00

    After that, I downgraded again back to 4.0 with the baseband still intact.
     
  9. iPadThai thread starter macrumors 6502a

    Joined:
    Apr 25, 2010
    #9
    No, I updated to 4.1 and baseband was updated as well. So I essentially lost the SIM UNLOCK potential. I just downgraded back to 4.0 originally - then suggested by Mavis to update to 4.0.1 - then my baseband reverted to 1.59.00

    Now it's all good :)
     
  10. charuzzi macrumors newbie

    Joined:
    Jul 16, 2010
    #10
    ไม่ทราบว่าเป็นคนไทยหรือเปล่าครับ
     
  11. The General macrumors 601

    Joined:
    Jul 7, 2006
    #11
    Pretty nice being able to downgrade your baseband.
     
  12. vinzer macrumors newbie

    Joined:
    Jun 16, 2010
    #12
    Thank you, not it is clear.
    I was thinking that there is an unlock for iphone4 and I missed it somewhere :)
     
  13. mavis macrumors 68040

    mavis

    Joined:
    Jul 30, 2007
    Location:
    Tokyo, Japan
    #13
    Wirelessly posted (iPhone 4 (32GB): Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_0_1 like Mac OS X; en-us) AppleWebKit/532.9 (KHTML, like Gecko) Version/4.0.5 Mobile/8A306 Safari/6531.22.7)

    Yeah, kind of odd though. :confused:
     
  14. andybno1 macrumors 68040

    andybno1

    Joined:
    Nov 6, 2007
    Location:
    Liverpool, UK
    #14
    I used iPhone umbrella on my iPhone 4 before any updates came out and it said I had my shsh thing done an sent to cydia but when I went to downgrade from 4.1 I checked the server and my phone never showed as havin shsh blob
     
  15. headcheese macrumors regular

    Joined:
    Sep 19, 2008
    #15
    Yeah...I'm asking how you know that. CLEARLY you want to look cool, like you have an "in", so impress me with your inside knowledge :rolleyes:
     

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