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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. aimetti's Avatar
      aimetti -
      haha

      ya , lockinfo / quick reply / backgrounder (sorry i dont care bout the battery drain) / and notifier

      i will settle for those 4
    1. Gom33's Avatar
      Gom33 -
      Add me to the jailreak list. Hahaha. I miss sbsettings. Lol

      Anyone try jailbreakme.com?

      Hahahahaha. Those were the days
    1. TheGrandFinale2001's Avatar
      TheGrandFinale2001 -
      Quote Originally Posted by aimetti View Post
      haha

      ya , lockinfo / quick reply / backgrounder (sorry i dont care bout the battery drain) / and notifier

      i will settle for those 4
      Quickreply, absolutely lol.
    1. sziklassy's Avatar
      sziklassy -
      Quote Originally Posted by bignighttrain View Post
      Apple is realy getting on my nerves if all my apple products and IDevices weren't so dam sexy and functional I would say phuck apple up the Azz.
      What a stupid thing to say. Wouldn't we say that about ANY company that doesn't make products worth buying? So your gripe with Apple now is that they make decent products? Some people...

      Quote Originally Posted by smoothcreak View Post
      I don't know much about unlocks and jailbreaks but if i'm not mistaken here I believe you need a jailbreak and unlock for t-mobile. Unlock so you can use it and jailbreak to turn off the 3g. So just an unlock for t-mobile users is no good???
      You have it a bit mixed up. In order to unlock, you need the jailbreak. 3G can be turned off regardless. It is a stock option in the OS. ATT users can do that as well without altering anything.
    1. Jahooba's Avatar
      Jahooba -
      I like how your layman's explanation in the second paragraph is just as confusing as the first.
    1. BlackG35's Avatar
      BlackG35 -
      I miss jailbreak. SlingPlayer has crappy quality over 3G and I cant do "real multitasking" like play XM Radio in the background.
    1. iHarryDo's Avatar
      iHarryDo -
      Ahh What will we do without these guys …
    1. Mrinfame's Avatar
      Mrinfame -
      I think what he was saying that if it wasn't for the fact that apple products are so cool. He wouldn't put up with the bullshît . But because they are he puts up with the fact that iPhone is locked to one carrier instead of being universal and also the modding provided by apple sux if it wasn't for jailbreaks iPhones are pretty boring. Go jailbreaks go unlocks and go apple for giving us something to jailbreak and unlock you gotta admit the cat and mouse game makes it exciting when a new jailbreak/unlock tool comes out. You just gotta learn how to play the game. Do not update unless 100% safe and save you shshs. Ps I'm enjoying my unlocked 3gs and I'm waiting for the smoke to clear out on all the iPhone 4 bull when issues are resolved and things are clear I will update
    1. AlexCrammer's Avatar
      AlexCrammer -
      I'm not a staff reporter so I can't post this but it's frekkin' awesome ^_^ the iPhone 4 is coming to T-Mobile in the UK!

      Apple iPhone 4 Coming To T-Mobile Soon - Register Now!
    1. Ace01xc's Avatar
      Ace01xc -
      yea apple always try to lock us out but cant, when there way to put it together it can be taken a part it just who seat thought all that decoding.
    1. jamriman's Avatar
      jamriman -
      Quote Originally Posted by dr0herb View Post
      You should have been able to retain ownership of the sim from the 3GS, they just need to "cancel" it and activate the micro sim.

      You need to keep the 3GS sim because its needed after a restore to activate the phone and be able to use an an ipod.

      All it should take is a phone call to ATT to disable the micro sim and re-enable the 3GS.
      Many thanks for info. Since I ruined my 3GS sim card should it matter since I plan to sell my 3GS when iphone 4 is JB?
    1. JoeyT1987's Avatar
      JoeyT1987 -
      Quote Originally Posted by AlexCrammer View Post
      I'm not a staff reporter so I can't post this but it's frekkin' awesome ^_^ the iPhone 4 is coming to T-Mobile in the UK!

      Apple iPhone 4 Coming To T-Mobile Soon - Register Now!
      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
    1. Cer0's Avatar
      Cer0 -
      Quote Originally Posted by AlexCrammer View Post
      I'm not a staff reporter so I can't post this but it's frekkin' awesome ^_^ the iPhone 4 is coming to T-Mobile in the UK!

      Apple iPhone 4 Coming To T-Mobile Soon - Register Now!
      Ummmm thought the UK T-Mobile already had the iPhone? Them getting 4 would be no real news I think.
    1. AlexCrammer's Avatar
      AlexCrammer -
      Well go to the site and see if it's serious!! :PP
    1. Cer0's Avatar
      Cer0 -
      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, the UK T-Mobile uses a different 3G frequency. The US T-Mobile operates on an odd 3G frequncey.
    1. JoeyT1987's Avatar
      JoeyT1987 -
      Thats what i figured. It sucks though AT&T, even though they are 3g, their plans are redic.
    1. Happy Noodle Boy's Avatar
      Happy Noodle Boy -
      Quote Originally Posted by cerote View Post
      No, the UK T-Mobile uses a different 3G frequency. The US T-Mobile operates on an odd 3G frequncey.
      To add to it, I'm pretty sure they're (T-Mobile USA) the only ones in the WORLD that use that particular frequency. Makes no sense.
    1. Cer0's Avatar
      Cer0 -
      Quote Originally Posted by Happy Noodle Boy View Post
      To add to it, I'm pretty sure they're (T-Mobile USA) the only ones in the WORLD that use that particular frequency. Makes no sense.
      The CMDA version of GSM lol. Nobody uses it outside of USA lol.
    1. JoeyT1987's Avatar
      JoeyT1987 -
      That just puts a on AT&T face, and a on mine.
    1. CyrusG's Avatar
      CyrusG -
      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