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  • iPhone4 Has New Baseband OS, ultrasn0w Will Need Rewrite


    The DevTeam and others have been checking through the iPhone 4, and have noticed the baseband runs a completely different OS than on previous models. The iPhone 3G and 3G[S] both ran Nucleus OS on the PMB8878 baseband CPU (aka XGold 608), where the iPhone 2G ran the PMB8876 (aka S-Gold 2). iPhone 4 uses the PMB9800, or X-Gold 618 - running a separate OS - ThreadX, an RTOS by ExpressLogic.

    UPDATE 06/29/2010 - After chatting with planetbeing today, I figured I'd add some specifics here. ThreadX is an RTOS. An RTOS is a Real Time Operating System, and in the iPhone 4's case, manages the baseband processor. This is a separate application processor than used by the main OS in the iPhone. The baseband handles the cell radio stuff - phone calls, 3G, etc. Anything using your cellular connection. Sometimes it has the GPS stuff too, although according to David Wang (aka planetbeing, from the DevTeam), it doesn't look like it does any GPS managing in this version - at least the OS treats it separately.

    Says David,

    ...then it gets rather technical. The baseband is segregated from the main applications processor and communicates with it over i2s, spi, and uart lines. The main processor controls it with (primarily) AT commands over some other transport protocol over the SPI and UART. When you're in a call, the BBP communicates directly with the audio codec over i2s so even if the main OS is freezing up, the call will still go on uninterrupted.

    The other advantage is security since if someone cracks iOS, the BBP is still separate. The two don't share any memory, so that's a security advantage.
    There's no indication of why Apple moved from Nucleus over to ThreadX, although they obviously had a reason strong enough to leave what they'd been using the past few generations of their flagship device.

    What's all that mean to you?

    Basically, once the iPhone 4 is jailbroken, the unlock won't be an immediate release. iOS4 is already un-lockable using ultrasn0w 0.93 on the earlier iPhone models, but the payload will need to be rewritten for iPhone 4 once an exploit is discovered in the new baseband OS. Hopefully the port itself will have introduced some. No way to estimate any sort of timeline until further investigating is done.
    This article was originally published in forum thread: iPhone4 Has New Baseband OS, ultrasn0w Will Need Rewrite started by Kyle Matthews View original post
    Comments 118 Comments
    1. BlackG35's Avatar
      BlackG35 -
      With T-mobile having such an international presence, its sad to see what its become here in the states. They should have used the euro 3g band so we could import cool phones from around the world.
    1. JoeyT1987's Avatar
      JoeyT1987 -
      How much is a iphone from Ca gonna cost? Like $600?
    1. CyrusG's Avatar
      CyrusG -
      You would have to buy it online fromthe online Canada appple store. It comes factory unlocked .. Officially from apple. I don't know why they're doing this.. But it's great. There's a FAQ on the website I think if you visit the Canadian version.
    1. JoeyT1987's Avatar
      JoeyT1987 -
      I wonder how much the shipping and any taxes would be if I order it in July?
    1. CyrusG's Avatar
      CyrusG -
      You would need a Canadian address to ship it to. They won't ship to American or Europe
    1. JoeyT1987's Avatar
      JoeyT1987 -
      Sucks again . Apple is focused on getting people in the US to go with AT&T.
    1. smuggler's Avatar
      smuggler -
      that's disappointing, good thing i don't need hacktivation or have an iphone 4
    1. Cowboy's Avatar
      Cowboy -
      ok maybe a stupid question but does the factory unlocked versions have different hardware than are iphones here in the US or is it all soft/firmware??
    1. jamriman's Avatar
      jamriman -
      Quote Originally Posted by JoeyT1987 View Post
      Sucks again . Apple is focused on getting people in the US to go with AT&T.
      Agreed. There service sucks big moose you know what!

      Quote Originally Posted by CyrusG View Post
      Guys.. Just buy a factory unlocked iPhone 4 from Canada when it comes out in late July. They stay unlocked if you buy it full price from the apple Canada store. Canadians are really excited about this becuase they were previously carrier locked
      Soooo much easier and logical to sit tight and wait for JB and unlock. Enjoy your iphone 4 until then.
    1. leletyM3's Avatar
      leletyM3 -
      I just need to JB my iPhone 4, I am on AT&T anyway
    1. DJM AutoWerkz's Avatar
      DJM AutoWerkz -
      Same here.
    1. vantheman169's Avatar
      vantheman169 -
      Quote Originally Posted by JoeyT1987 View Post
      Is this serious!?! Does that mean that it could come to TMobile USA, or does it have something to do with a AT&T exclusivity:

      iPhone 4 coming to T-Mobile UK ? The Register
      No T-mobile overseas runs on the same MHZ for 3g network as AT&T does. T-mobile USA runs on a totally different MHZ so no T-mobile USA will not be getting the iphone anytime soon unless they make a different version with a different radio in it.

      T-Mobile: 1700/2100 MHz
      AT&T: 1900 MHz

      So you will just have to wait for an unlock and use your iphone 4 on edge b0000

      T-mobile can only use EDGE as we all know if your on t-mobile. Thats why i switched to AT&T to use there fast 3g network. And its totally worth it, but if t-mobile had the iphone 3g capabilities i would have stuck with them for sure.
    1. realjaja's Avatar
      realjaja -
      Hope someone figures it out, cause I'm tired of just being on wifi.
    1. dbet21's Avatar
      dbet21 -
      ok listen i dunno where else to post this so dont get mad, move it to a better forum for all i care. but i have an iphone4 and where it should say at&t it has my fake carrier logo (dbet) that was on my jb'd 3gs. has this happened to anyone else? i think its because i restored my i4 from my 3gs backup and where it have the wifi fan on my wifes phone it has number for her wifi instead like on her jb'd 2g

      i also have a pic of it but i dunno how to upload it
    1. Chuck1969's Avatar
      Chuck1969 -
      ^^^mine did the same, also lost my statusbar clock. Come on jailbreak! =)
    1. delizaza23's Avatar
      delizaza23 -
      What did I say when they were all happy when IOS 4 jailbreak was out. I told you Apple will show you left and punch with right. I am saying now and keep a note of this. buy the time hackers discover it Iphone 5 will be out or very close to be out. I hate to say but Apple is a winner and hackers are 18 months behind. and I am still waiting windows mob 7 to be improved with a lot of apps. don't worry that day will come and i will be showing apple left and hammer on the head although I love apple computers and products. ARE YOU READY TO HAMMER.
    1. relkorama's Avatar
      relkorama -
      Quote Originally Posted by cerote View Post
      And where did Apple say something about Factory Unlocked for Life? And no it is not that easy. They already do unlocks in other countries and sell unlocked phones. So if it could be done it would have already been done.
      iPhone 3GS & iPhone 4 - Apple Store (Canada)

      Quote Originally Posted by AppleStoreCanada View Post
      Your new iPhone. Direct from Apple and ready to use.

      When you purchase your iPhone from the Apple Online Store, you’ll get it commitment-free. So you can sign up for service with the carrier of your choice and change your carrier at any time. Questions? Call our iPhone experts at 1-800-MY-APPLE.
    1. whereswaldo's Avatar
      whereswaldo -
      lucky i'm not an unlocker
    1. joe97's Avatar
      joe97 -
      Quote Originally Posted by dbet21 View Post
      ok listen i dunno where else to post this so dont get mad, move it to a better forum for all i care. but i have an iphone4 and where it should say at&t it has my fake carrier logo (dbet) that was on my jb'd 3gs. has this happened to anyone else? i think its because i restored my i4 from my 3gs backup and where it have the wifi fan on my wifes phone it has number for her wifi instead like on her jb'd 2g

      i also have a pic of it but i dunno how to upload it
      You're right about it being because you restored from you JB'd iPhone, just reset network settings on your iPhone 4 and it'll re-set the AT&T. If that doesn't do it reset all settings...you won't lose any data, it's one of those I can't remember which one but that's what it says in one of these threads and it works--
    1. JayQuint87's Avatar
      JayQuint87 -
      Can't wait