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sgs2 unbranded lost root after 4.0.4 upgrade

Discussion in 'Android Devices' started by class37s, Aug 10, 2012.

  1. class37s

    class37s Lurker
    Thread Starter

    Hello all,

    I hope someone may be able to help me in this. I previously rooted my s2 on stock 4.0.3, using the excellent chainfire method with odin, however I decided to upgrade over air to 4.0.4 and have lost root. I have read that there is a risk of hard bricking with rooting 4.0.4 but would like to know if, and how, it can be done safely. I still have odin v3 3.04. I also have a backup of 4.0.3 rom on my sd card. Any help is appreciated.

    phone details as follows

    base xxlq6
    kernel 3.0.15-19100xwlpt - cl941023
    smp preempt fri jul27

    build imm76d.xwlpt

    1. Download the Forums for Android™ app!


  2. Shotgun84

    Shotgun84 Extreme Android User

    I think you need to download the .tar version of siyah and flash with Odin. I'm not 100% sure though as I no longer own my gs2 so maybe hold fire until someone else can confirm.
  3. Shotgun84

    Shotgun84 Extreme Android User

    I've had a chat with a wise man and you're safe with flashing the siyah.tar with Odin.
  4. Newbie Alert

    Build Info: Fri Jul 27 17:41:49 KST 2012

    Android 4.0.4
    Baseband: I9100XXLQ6
    Kernel: 3.0.15-19100XWLPT-CL941023
    SMP PREEMPT Fri Jul 27 18:08:15 KST 2012

    Build: IMM76D.XWLPT​

    I, too, lost root after allowing Kies to update.

    Siyah is mentioned above. And the "Rooting Galaxy S2 - A Dummies Guide" has been updated with the following

    1) Can I check that it's OK to use LQ5 if I'm already on LQ6

    suggests going numerically up not down!

    2) Can anyone explain what the Siyah Kernel will actually install? The only reason that I want root is to be able to use Titanium Backup.

    3) To install the Siyah Kernal, do I:

    Then start at Step 2 again?

    and continue as before?
  5. ironass

    ironass Extreme Android User

    Spot on DroidAlbatross.

    The reason for using LQ5 is that it is the latest CF-Root kernel for Android 4.0.4 to be released by Chainfire.

    The reason for flashing Siyah, for the S2, straight away, using Odin and the .tar file rather than the CWM .zip file, is that Android 4.0.4 kernels contain the, "brick bug", which is activated by using CWM.

    Once you have installed the Siyah kernel you are safe to use CWM and there is no danger from the, "brick bug".

    EDIT Since writing my amendments to the Rooting for Dummies Guide, chainfire has now launched CF-Root kernrels for:- LPO, LPT, LPU and LQB. So use LPT these instead.
    DroidAlbatross likes this.
  6. Many thanks for the update!

    So I want this one: CF-Root-SGS2_XW_NEE_LPT-v5.6-CWM5.zip ?
  7. ironass

    ironass Extreme Android User

    That's the one! :D
    DroidAlbatross likes this.
  8. goodmeme

    goodmeme Lurker

    Hi guys,

    I think I'm in the same boat, I need to root to backup on my wifes i9100.

    Model number : GT-I9100
    version 4.04.
    baseband version: i9100xxlq6
    kernel version: 3.0.15-i9100xwlpt-cl941023
    SMP PREEMP fri Jul 27 18:08:15 KST 2012

    Build number:

    Sorry to sound like such a noob there doesn't seem to be clarity out there on the big ol' web.

    I'm assuming I'll have to download odin software and have to do the equivalent of copy-pasting a new file into the phone, is that correct, or do I have to re-install a new version of the OS? I'd love not to have to re-install as I've set up the phone to her liking.


    I'm really sorry to be so unknowledgeable about this, I wouldn't need to be getting into roms and such, except she was (via persistant messages) railroaded into updating to 4.04 from 4.03 over the air, and has lost ability to write to her external sd card. I really don't want to maintain all the PCs and our phones if they're suddenly going to update without my consent - none of my PCs do this- so I figure I need to freeze the updater or something to prevent this sort of thing happening.

  9. ironass

    ironass Extreme Android User

    Hello and welcome to Android Forums goodmeme! :)

    Everything you need to know about rooting is contained in posts #1 and #2 of the, "Rooting Galaxy S2 - A Dummies Guide".

    I see that you are using an LPT kernel and so therefore you will need this, LPT, CF-Root kernel, here.

    Please read those posts, carefully and thoroughly, before proceeding as they should answer all of your questions.

    Post #2 gives details on how to make nandroid and Titanium backups of the phone.

    To disable Software updates... Settings > About phone > Software update > uncheck the boxes. Alternatively, you could freeze the Update system app by using Titanium Backup, as explained in post #2, under Bloatware.

    Hope this helps.
    goodmeme likes this.
  10. goodmeme

    goodmeme Lurker

    Just to confirm, this will work with the GT i9100? The GT i9100 is not listed in those posts explicitly and it's all a bit scary :). I'm assuming the GT-i9100 is simply referred to as i9100 but just want to check!

  11. ironass

    ironass Extreme Android User

    All those models have the prefix GT- so the i9100 is in fact the GT-i9100.
    goodmeme likes this.
  12. So I haven't got round to doing anything further!! :thinking:

    But I think it's about time!

    All details are as they were above!

    Do I now want

    1) CF-Root-SGS2_XW_NEE_LPT-v5.6-CWM5.zip and follow that up with Siyah v5.0.1?
    2) a more up-to-date CF-Root kernel that avoids the "brick bug"?
    3) one of the PhilZ kernel files?
    4) a mix of the above?

    Many thanks and this time I'll make use of your advice!

Samsung Galaxy S2 Forum

The Samsung Galaxy S2 release date was April 2011. Features and Specs include a 4.3" inch screen, 8MP camera, 1GB RAM, Exynos 4210 Dual processor, and 1650mAh battery.

April 2011
Release Date

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