iPhone Finally! iPhone 3GS Baseband Downgrade Available!

Discussion in 'Jailbreaks and iOS Hacks' started by KJmoon117, Jun 18, 2012.

  1. macrumors 6502a

    Joined:
    Jun 10, 2007
    Location:
    NC
    #1
    Finally the iPhone Dev-Team or Musclenerd has finally released the 6.15 baseband downgrade for us iPhone 3GS users who screwed up upgrading to the iPad baseband.

    http://blog.iphone-dev.org/post/25350690843/0615-fun

    Now we can downgrade to a unlockable baseband while being able to use our GPS... or we can now sell our phones ;)
     
  2. macrumors 6502

    occamsrazor

    Joined:
    Feb 25, 2007
    #2
    This is great news. One thing I'm not clear about though - my 3GS is currently on baseband 05.16.05 (therefore not unlockable). Can I use this to downgrade to 05.13.04? If so can I do this directly, or must I "upgrade" to 06.15 first as an intermediary step?
     
  3. thread starter macrumors 6502a

    Joined:
    Jun 10, 2007
    Location:
    NC
    #3
    Yes you'll have to first upgrade to 06.15. However, be very careful to see if that baseband is compatible. Read the instructions FULLY or else you may fry your radio.
     
  4. macrumors 6502

    occamsrazor

    Joined:
    Feb 25, 2007
    #4
    Thanks... I'll check the baseband compatibility with 06.15 in detail later. Can I use the same RedSnow latest 0.9.14b1 to do the upgrading to 06.15?
     
  5. macrumors 68030

    aziatiklover

    Joined:
    Jul 12, 2011
    Location:
    8.8.8.8 and 8.8.4.4
    #5
    Yes u can use the latest to upgrade or downgrade baseband.
     
  6. macrumors 6502

    Joined:
    Jan 3, 2012
    #6
    I tried downgrading several times, and my baseband still shows as 06.15

    Any ideas?
     
  7. macrumors member

    Joined:
    Jun 20, 2008
    #7
    Does this work on bricked iPhones as well

    Curious to know if this will work on my bricked iPhone as I wont be able to do a controlled shutdown.
     
  8. macrumors 6502

    Joined:
    Jan 3, 2012
    #8
    Sadly, no
     
  9. thread starter macrumors 6502a

    Joined:
    Jun 10, 2007
    Location:
    NC
    #9
    Actually I was able to downgrade my phone that was in a perpetual DFU mode. Not sure if that counts as bricked.
     
  10. occamsrazor, Jun 19, 2012
    Last edited: Jun 19, 2012

    macrumors 6502

    occamsrazor

    Joined:
    Feb 25, 2007
    #10
    Dev-team says:

    This doesn't make sense to me. My serial is 889431xxxxx which would imply it is not compatible with 06.15. However my 3GS was bought much earlier than week 34 of 2011, I think it was sometime in early 2010. Or am I reading the wrong serial? I'm looking at Settings > General > About > "Serial Number"

    EDIT: This useful website decodes my serial as:
    Production year: 2009
    Production week: 43 (October)
     
  11. macrumors regular

    Joined:
    Mar 2, 2012
    #11
    You need to check your 3GS and make sure it doesn't also have the old BootROM. It's right within the zone were they started being changed to the new BootROM
     
  12. macrumors 6502

    occamsrazor

    Joined:
    Feb 25, 2007
    #12
    Bootrom is 359.3.2, which I believe makes it NEW BootROM - so where does that leave me?
     
  13. dZp
    macrumors 6502a

    Joined:
    Mar 29, 2006
    #13
    nvm
     
  14. macrumors 6502

    occamsrazor

    Joined:
    Feb 25, 2007
    #14
    Wow... Had to be very patient over about 2 hours... but it worked! First I upgraded to 06.15 then redid the whole process and downgraded, then installed Ultrasnow, and voila... my 3GS that had been useless for the last 6 months is now a phone again. Big kudos to musclenerd for getting this working. I was waiting the last six months hoping a solution would be found, have to say I was sceptical it would ever happen, but he delivered.
     
  15. macrumors regular

    Joined:
    Dec 20, 2010
    #15
    just like to make sure if my serial for my 3gs is XX929XXXXXX then i can't downgrade my baseband? and i should not try to unlock with new redsnow?

    Just dig a little more deeper...and found out my iphone info..

    according to the website above.

    which showed my iphone is
    Production year: 2009
    Production week: 29 (July)

    but accroding to the news post where it stated " The iPad baseband is not compatible with 3GS units manufactured week 34 of 2011 or later"

    at this point it looks like i can install ipad baseband.but it went on with

    "If you have an iPhone3GS and if digits 3-5 of its Serial Number are 134 or later (xx134…), then you should NOT try to install the 06.15 baseband on your 3GS! It will brick your radio, preventing both the downgrade from working and normal iPhone software from using it as a phone! Be warned!"


    so wit my ser number is XX929XXXXXX am i able to downgrade my 3gs without brick your radio, preventing both the downgrade from working and normal iPhone
     
  16. macrumors newbie

    Joined:
    Jun 20, 2012
    #16
    Need some help on this.

    Hey there, i got a 3GS, with BB 06.15 with an sn0wbreeze hacktivated ISPW. I unlocked it with ultrasn0w but notifications didn't work, and managed to install SAM when it worked, unlocked it with it and notifications and GPS are working correctly since then, even though there are still some battery issues, (ultrasn0w and SAM on this).

    I'm looking forward to sell this phone, and i was wondering if i downgrade the baseband will i lose my notifications (wich SAM fixed back then) when i install ultrasn0w again?. What i want, is to be able to restore with an original IPSW, unlock it with ultrasn0w and have notifications fully working (if its possible). Is it safe to go for it?, or what should i do in this case?. Please let me know. Thanks.
     
  17. macrumors newbie

    IanCO

    Joined:
    Mar 30, 2012
    Location:
    Trinidad & Tobago
    #17
    Is it that the only way to downgrade to 05.13.04 is to upgrade to 06.15? Does this mean that ppl with iphone 3gs's after week 34 of 2011 with 05.16.05 bb are screwed??
     
  18. macrumors G4

    dhlizard

    Joined:
    Mar 16, 2009
    Location:
    The Jailbreak Community
    #18
    Actually any 3GS made after the 27th week of 2011 is likely to be damaged if the iPad baseband flash is attempted.

    Without the baseband flash, the downgrade cannot occur.
     
  19. macrumors newbie

    IanCO

    Joined:
    Mar 30, 2012
    Location:
    Trinidad & Tobago
    #19
    then I'm screwed!
     
  20. macrumors Nehalem

    Applejuiced

    Joined:
    Apr 16, 2008
    Location:
    At the iPhone hacks section.
    #20
    Pretty much.
     
  21. macrumors G4

    dhlizard

    Joined:
    Mar 16, 2009
    Location:
    The Jailbreak Community
    #21
    But you can get a carrier or grey market dealer IMEI unlock.
     
  22. macrumors newbie

    Joined:
    Jan 6, 2013
    #22
    I would like to try your trick but I can't find out how to upgrade to 06.15 first...having already everything I need to downgrade to the iPad baseband. Some help would be really appreciated since I've been stuck for over 2 hours already! Thanks
     
  23. macrumors G4

    dhlizard

    Joined:
    Mar 16, 2009
    Location:
    The Jailbreak Community
    #23
    There is a step by step tutorial on iClarified.com
     
  24. macrumors newbie

    Joined:
    Jul 17, 2013
    #24
    I have 3gs new bootrom in iOS 5.0.1 BB 6.15.00 i contact to the imei unlocker they said that iphone must be have 5.13.04 to factory unlock so if i downgrade bb so it will brick my radio
     
  25. macrumors G4

    dhlizard

    Joined:
    Mar 16, 2009
    Location:
    The Jailbreak Community
    #25
    New bootrom does not mean you cannot downgrade the baseband.
    Any 3GS made before the 27th week of 2011 can be safely downgraded.

    If you are getting IMEI unlock, no need to preserve baseband.
     

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