Results 1 to 5 of 5

Your favorite Apple, iPhone, iPad, iOS, Jailbreak, and Cydia site.


Thread: About to Jailbreak/Unlock a 3G iPhone 4.2.1. Do I have everything I need?

  1. #1
    Default About to Jailbreak/Unlock a 3G iPhone 4.2.1. Do I have everything I need?
    I've been out of the loop a while since JB/Unlocking my 2G iPhone so I'm a bit overwhelmed by the tools available for the newer firmware.

    I just got a used 3G iPhone with firmware 4.2.1 installed. A while back I remember the 4.2.1 fw could not be unteathered jailbroken, but now it appears it can.

    I'm about to use this YouTube video instruction found on the redmondpie site. Can someone confirm that this guide is valid?
    I'm running Windows 7 so basically the guide has you use Snowbreeze to jailbreak and recommends to select "Activate iPhone" if you plan on unlocking later; which I will since I'm on T-mobile.

    So just to verify, after running Snowbreeze I install Ultrasnow which will allow me to unlock the phone correct?
    Are there any other steps I'm missing or should be aware of?
    Or better yet is there better JB/Unlock tools available or is Snowbreeze the way to go right now?

    Also can someone tell me what exactly Snowbreeze does? It appears to create it's own 'custom' firmware, but once installed will it have things like Cydia already installed?

    Thanks

  2. #2
    Retired Moderator
    Join Date
    Jun 2009
    Location
    Alhambra, CA
    Posts
    16,904
    Thanks
    137
    Thanked 2,202 Times in 1,924 Posts

    Unlocking requires you to update the baseband to the iPad baseband, which will break your GPS. When restoring on 4.2.1 you would also only be able to use custom firmware from then on. If you are willing to accept those conditions, this is all you have to do:

    1) get redsn0w 0.9.6rc19
    2) get stock 4.2.1 ipsw
    3) run redsn0w and select the 4.2.1 ipsw
    4) select to install Cydia and the iPad baseband
    5) continue on to follow the instruction to DFU
    6) once finished you can access Cydia on your springboard
    7) install Ultrasn0w from Cydia after doing the essential upgrades

    There is no need for sn0wbreeze or custom firmwares for you at this point.

    Edit: I was assuming you are on stock 4.2.1 so you would have the bb of 5.14.xx. Check that out before you do these steps. Also use f0recast and see what bootloader you have. With bootloader 5.8 you can downgrade the baseband instead of having to upgrade it. It's a slim chance to have the 5.8 bl but hey why not check just to be sure

    If you do have the 5.8 bl let me know and I can help you to downgrade the bb. If you have 5.9 or 6.4 then my above steps are indeed the only option.
    Last edited by i.Annie; 2011-07-27 at 05:30 AM.

  3. #3
    My iPhone is a Part of Me xtacy's Avatar
    Join Date
    May 2011
    Location
    Mumbai
    Posts
    980
    Thanks
    1
    Thanked 93 Times in 92 Posts

    One more thing your phone will run 3.1.3 much better then 4.2.1 :-)

  4. #4
    Quote Originally Posted by i.Annie View Post
    Unlocking requires you to update the baseband to the iPad baseband, which will break your GPS.
    Is this because when the fw got updated to 4.2.1 the baseband was also updated with a version Apple tried to make un-unlockable?

    Quote Originally Posted by i.Annie View Post
    When restoring on 4.2.1 you would also only be able to use custom firmware from then on.
    What if I downgraded to 3.1.3 as xtacy suggests? will I still only be able to use custom firmwares... regardless of version?

    Quote Originally Posted by xtacy View Post
    One more thing your phone will run 3.1.3 much better then 4.2.1 :-)
    So should I downgrade to 3.1.3 from 4.2.1? Does this involve anything more than acquiring the older firmware and selecting the 3.1.3 from Redsn0w when prompted?

    Also, I forgot to ask about Whited00r. I'm looking into turning my old 2G (first gen) iPhone into a dedicated iPod for my car. Currently it crashes about once every couple days and I think it may be due to all the stuff I've installed over the course of owning it (jailbroken, unlocked, custom skins, etc).
    If Whited00r is optimized to run better on older phones is that a better way to go? Including for the 3G
    Last edited by MinimusMaximus; 2011-07-27 at 05:30 PM.

  5. #5
    Livin the iPhone Life
    Join Date
    May 2008
    Posts
    8,021
    Thanks
    102
    Thanked 789 Times in 731 Posts

    Quote Originally Posted by MinimusMaximus View Post
    ...If Whited00r is optimized to run better on older phones is that a better way to go???
    If reliability and stability are important, stay away. Use jailbreaking and unlocking tools/utilities from well-known and respected sites. Dev-Team Blog

Posting Permissions
  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •