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Thread: Ultrasn0w version 0.9 is out!

  1. #1
    Default Ultrasn0w version 0.9 is out!


    Short version:
    ultrasn0w version 0.9 is out! We believe it solves pretty much all of the various random issues that have been reported. Its features include:

    * Works on both 3G and 3GS
    * Works on hacktivated devices
    * Works regardless of how you jailbroke your device
    * Doesn’t patch any mach-o binary whatsoever. (Doesn’t require a separate patch as each new firmware comes out).
    * Doesn’t install any additional daemon
    * Has no race conditions, no popups about “Missing SIM”, no network issues
    * Is almost 7000 times smaller than its nearest competition
    * Is available now via Cydia. Source repo is ultrasn0w.com (that last “0” in ultrasn0w is a zero!)
    Long version:
    The day before yesterday, some fellow named geohot released a program called “purplesn0w” which claims to be a better unlock than our ultrasn0w unlock released last month, and our yellowsn0w unlock released 7 months ago. He was kind enough to provide source, which we naturally took apart to try to validate his claims.

    We’ve found he had come up with two pretty neat ideas, one more pragmatic than the other for the iPhone. The first is a way of patching the actual text of the baseband code by copying it over to RAM and then using the MMU and page tables to have the baseband pretend it is part of the original bootrom. Of course, like yellowsn0w and ultrasn0w, this code has to be reloaded with every reboot of the baseband. However, the advantage of this is that developing unlocking payloads is a lot simpler… in fact, geohot used the same payload in AnySim and BootNeuter. We kicked around this idea ourselves before, but eventually found a work-around for the same problem with the yellowsn0w/ultrasn0w payload. The two pieces of code have the exact same effect on the baseband… with the difference that geohot’s exploit overwrites an arbitrary block of memory one megabyte in size. The baseband has a total of eight megabytes of memory and every bit of it is earmarked for use (except for 485212 bytes of it which we haven’t accounted for yet, but that’s still less than 1 MB). This means that eventually the area of memory geohot is using will be corrupted and 1 MB of baseband code will be corrupted (until the next reboot). How soon will this happen? Will it even matter in day-to-day use? We don’t know, because we haven’t spent much time looking. However, why take the risk when the yellowsn0w/ultrasn0w payload accomplishes the same job with no corruption?

    To put it into perspective, ultrasn0w uses 152 bytes of properly malloc’d baseband RAM, which is 0.015% of what purplesn0w uses. Put another way, purplesn0w uses 6900 times more RAM than ultrasn0w (and doesn’t let the O/S know that it’s using it, so the O/S still thinks it’s free to use. When it does use it, the baseband will crash).

    Now, the second new idea he had was to patch CommCenter rather than use a daemon. At first, this idea seemed pretty distasteful to us. Binary patches are messy and difficult to maintain (we figure it’s partly why he only made a version for 3G S and not 3G as well). In addition, the stated reason of reduced battery life with a daemon is factually incorrect, since any computer science student who’s taken a course in operating systems will tell you that a sleeping task takes up exactly NO CPU resources and NO power (it’s merely skipped over during context switches). That’s right: not “only a little” power, but absolutely NO power. However, ultrasn0w 0.6 did have a problem where the STK refresh command it used crashed the baseband in 3G S. This caused the baseband to continually come up and then restart. That DOES take power and so may explain the issues that people have been seeing. ultrasn0w 0.8 was supposed to have fixed this issue, but perhaps not completely. This is because the STK refreshes we used are inherently unreliable… but we thought they were necessary to avoid people having to reinsert their SIM. Turns out we were wrong on that score. geohot’s method shows that we can perform the unlock before CommCenter polls for lock state. When we do it before (instead of after), the STK refreshs are no longer necessary! The only way to do it before the polling, however, is to modify CommCenter.

    We’ve tried to make the best of a bad situation by using MobileSubstrate to perform the modification. This lets us modify the behavior of CommCenter without touching the actual binary. We also used a method to dynamically locate the patch location so that it should work on both 3G and 3G S (and should need to be updated less frequently). We also do it in a different way so that hactivated phones will work with the unlock (unlike purplesn0w). You’ll find that this update is now available through Cydia as ultrasn0w 0.9 We thank geohot for contributing to the scene once again. We don’t think purplesn0w is the right path, but it has certainly helped us improve ultrasn0w!


    P.S. geohot, seriously, stop dicking around and look at the bootrom instead kthx. =P
    Source

    Found it odd that no one posted this.
    I know this site is a bit bias, but damn...
    Seems like a great release for unlockers!

    Well done DevT, long live competition!
    Last edited by thu6; 2009-07-16 at 02:42 PM.

  2. #2
    Retired Moderator StealthBravo's Avatar
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    Yea, way to go! Keep using geohot as s crutch yet call him a fool.

  3. #3
    hehehe, i'll leave the politics to you guys.

    I do know GeoHot has done a lot of good since his resurface to the scene.
    The kid's def no joke. Very versatile.

    I'm glad all these egos are clashing. In the end, we the iphone owners are the true winners.

  4. #4
    Retired Moderator StealthBravo's Avatar
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    geohot:
    With regards to devs comment that I use tons of ram, that was all RC1. This one uses 0, yes ZERO, bytes of ram after it is installed. But I'm happy you guys came around to my way of unlocking :-) And not just one of my ideas. You took them both.

  5. #5
    Days of Our Lives ain't got nothing on this drama.

    lol, fun times ahead...

    added:
    ...dev took my ideas, and they have way more patience than me for features. got something way cooler coming =)
    ooooo
    /stays tuned
    Last edited by thu6; 2009-07-16 at 04:07 PM.

  6. #6
    Green Apple
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    Gee, updated the Mobile Substrate and Ultrasn0w from Cydia only for it to brick my phone. Keeps trying to reboot without success. I manually shut the phone down hopeing a hard reboot would help but no luck. Looks like I will have to do a restore and start all over. Here goes a waste of several hours! Thanks Dev team!

  7. #7
    Quote Originally Posted by ACSS View Post
    Gee, updated the Mobile Substrate and Ultrasn0w from Cydia only for it to brick my phone. Keeps trying to reboot without success. I manually shut the phone down hopeing a hard reboot would help but no luck. Looks like I will have to do a restore and start all over. Here goes a waste of several hours! Thanks Dev team!
    never update the two most important things on your phone at the same time... you should have installed mobile substrate rebooted, then installed ultrasn0w...

    if you did that, (the same thing i did), and it didn't work, that sucks, sorry to hear, get an at&t card and go purple

  8. #8
    Retired Moderator StealthBravo's Avatar
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    Just go purple! LMAO

  9. #9
    iPhoneaholic A_DuB187's Avatar
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    Quote Originally Posted by StealthBravo View Post
    Just go purple! LMAO
    ^^+1
    160GB iPod Classic
    8GB 2G - Firmware 2.2.1 PWN'D
    8GB 3G - Firmware 3.0 PWN'D
    16GB 3G S - Firmware 3.0 Ra1n'n Purple
    64GB iPad 3G - Spirit'd
    32GB iPhone 4

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