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  1. Thread Author  Thread Author    #1  
    Caleb Morris's Avatar

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    Default Unlocked bootloader, S-Off, AOSP explanation

    For starters, I'm a slightly experienced root user. I rooted my original EVO, and I flashed to my hearts content with no problems. I used the Unrevoked method and only unrooted when it was time to upgrade the this phone. I've looked here and XDA for help and explanations on this topic, but I haven't found any that really suffice. I don't understand the premise behind an unlocked bootloader and S-Off. I know what S-Off is and what it does, but the unlocked bootloader is what has me stuck. I don't understand how that works if I can't flash a kernel with just an unlocked bootloader, how can I flash an AOSP rom? And there have been no real instructions that I have seen on how to do this with Hboot 1.19. I also can't use Dirty Racun due to having a x64 computer. Can someone please help, or at least point me in the right direction? I've also never used TWRP. I only used CWM and the other recovery for EVO 4G (can't remember the name right now). Any help would be much appreciated.

    Sent from my EVO using Android Central Forums
  2. #2  
    benny3's Avatar
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    Default Re: Unlocked bootloader, S-Off, AOSP explanation

    You need a unlocked bootloader so you can write to the partitions like the recovery partition so you can install a custom recovery to be able to flash roms...ect.
    S-on will let you flash roms, mods and such but will not let you write to the boot partition which is needed to flash custom kernels...ie boot.img
    S-off removes the flag so you can write to the boot partition and no need to use a third party app or fastboot to flash the bootimg
    If you flash 2 different roms that both have a stock boot.img more than likely you will not have a problem. As soon as there is a change in the kernel or boot.img you will need to flash it for it to boot
    To flash the boot.img with fastboot you will need to copy the boot.img to the platform-tools folder or the folder which contains fastboot abd adb. Boot the phone into the bootloader, put in fastboot mode ( fastboot usb )
    open your cmd prompt from the fastboot folder and type "fastboot flash boot boot.img"
    i know this explanation is a little crude but i hope it helps
    Last edited by benny3; 11-22-2012 at 11:15 AM.



  3. Thread Author  Thread Author    #3  
    Caleb Morris's Avatar

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    Default Re: Unlocked bootloader, S-Off, AOSP explanation

    I understand the concept, and I had read about flashing from fast boot for kernels. So to flash CM10 from unlocked bootloader only (that's the main ROM I want). Would I need to use the fast boot method to flash it since it is AOSP?

    Sent from my EVO using Android Central Forums
  4. #4  
    benny3's Avatar
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    Default Re: Unlocked bootloader, S-Off, AOSP explanation

    if your s-on Yes if your s-off No



  5. #5  
    dskwerl's Avatar

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    Default Re: Unlocked bootloader, S-Off, AOSP explanation

    I've been running CM10 for a couple of weeks now, after spending 2 days trying to prep my EVO for it. After trying to run CM10 with root and S-ON, the startup animation would just spin endlessly. Initially, I couldn't find much information on what I was missing, so I finally decided to try getting S-OFF. After a couple of failed attempts, I got it to work, then CM10 booted up like a charm.

    DirtyRacun was the method I used, and it didn't work the first time I tried it. But it took me a while to figure out that this step was necessary for CM10 to boot.

    Edit: Realized I used DirtyRacun for S-Off, not Unrevoked.
    Last edited by dskwerl; 11-28-2012 at 09:43 AM.
  6. Thread Author  Thread Author    #6  
    Caleb Morris's Avatar

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    Default Re: Unlocked bootloader, S-Off, AOSP explanation

    The thing is, I can't get S-Off, unless there is another method other than Dirty Racun for Hboot 1.19. I've looked at XDA and seen that Regaw mod might work, but I'm not sure. If I had a sure fire way of rooting (S-Off) , it would have been done by now. Any help?

    Sent from my EVO using Android Central Forums
  7. #7  
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    Default Re: Unlocked bootloader, S-Off, AOSP explanation

    Quote Originally Posted by Cmorris8848 View Post
    The thing is, I can't get S-Off, unless there is another method other than Dirty Racun for Hboot 1.19. I've looked at XDA and seen that Regaw mod might work, but I'm not sure. If I had a sure fire way of rooting (S-Off) , it would have been done by now. Any help?

    Sent from my EVO using Android Central Forums
    Have you looked here This is how i did it and it keeps everything in place. once you downgrade your hboot you are able to use lazy panda
    I havnt heard of using Unrevoked on the LTE



  8. Thread Author  Thread Author    #8  
    Caleb Morris's Avatar

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    Default Re: Unlocked bootloader, S-Off, AOSP explanation

    Linux, my computer, and my wifi network do not get along. It is a horrible three-way relationship. I tried Ubuntu last year, and it own't connect to my wifi network, so anything Linux, I stay away from. I'll probably wait a few more months for some surefire methods on rooting using windows, and then unrooting as unrevoked had for the original Evo. It is sounding like we might be getting official Jelly Bean quite soon though. Thank you for your input
  9. #9  
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    Default Re: Unlocked bootloader, S-Off, AOSP explanation

    Quote Originally Posted by Cmorris8848 View Post
    Linux, my computer, and my wifi network do not get along. It is a horrible three-way relationship. I tried Ubuntu last year, and it own't connect to my wifi network, so anything Linux, I stay away from. I'll probably wait a few more months for some surefire methods on rooting using windows, and then unrooting as unrevoked had for the original Evo. It is sounding like we might be getting official Jelly Bean quite soon though. Thank you for your input
    All you need is a live cd or wubi which can be downloaded with windows and then boot with the live cd and then run the program. no need to install ubuntu



  10. #10  
    dskwerl's Avatar

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    Default Re: Unlocked bootloader, S-Off, AOSP explanation

    Something I just thought of about obtaining S-OFF: are you using 64-bit or 32-bit Windows? DirtyRacun won't work with 64-bit. I happened to have Windows 7 32-bit on my laptop, and that's what I used to get it to run. As I mentioned before, I had to run DirtyRacun a couple of times before it worked all the way through.
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  11. Thread Author  Thread Author    #11  
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    Default Re: Unlocked bootloader, S-Off, AOSP explanation

    I have 64-bit Windows. I looked at Dirty Racun and Evita Toolkit thing after installing wubi tonight to get Ubuntu 12.10, and they only work with 32-bit Linux. So there is no way I can root my phone right now with my laptop. I guess I will just wait until another S-Off method pops up that I can use.

    Sent from my EVO using Android Central Forums
  12. #12  
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    Default Re: Unlocked bootloader, S-Off, AOSP explanation

    Download the 32 bit ubuntu live cd or you can put it on a flash drive its easy



  13. #13  
    dskwerl's Avatar

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    Default Re: Unlocked bootloader, S-Off, AOSP explanation

    Yep, a LiveCD (or USB stick, whichever strikes your fancy) is a pretty simple option. If you go to Ubuntu's website, one of their download options is to make a LiveCD. Just boot to the CD, install DirtyRacun, let it perform its magic, and off you go. When you're finished, all you do is take the disc out and reboot your computer. No permanent changes to your computer and you have S-OFF!
  14. #14  

    Default Re: Unlocked bootloader, S-Off, AOSP explanation

    Does this wipe my phone or just turn S-OFF?
    Sprint Samsung GS3 (cya SPRINT!) > 32GB Nexus 5
  15. #15  
    dskwerl's Avatar

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    Default Re: Unlocked bootloader, S-Off, AOSP explanation

    You have to go back to factory stock (unroot, et all) before you can run the process. As such, you'll need to wipe your phone in preparation for running DirtyRacun. The instructions can be found here: .
  16. #16  

    Default Re: Unlocked bootloader, S-Off, AOSP explanation

    Awesome, thank you very much for the clarification.

    I had my OG Evo rooted and am now debating rooting this since CM10 is out.

    Is CM10 relatively stable with all things working (LTE, camera, etc)?
    Sprint Samsung GS3 (cya SPRINT!) > 32GB Nexus 5
  17. #17  
    dskwerl's Avatar

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    Default Re: Unlocked bootloader, S-Off, AOSP explanation

    I've been using it exclusively for a couple of weeks now, and it runs great for me. It is very smooth, and I haven't really encountered any multitasking issues.

    I don't have access to LTE, so I can't make any claims about that.

    You don't get the HTC camera app, however it seems to work just fine with other camera apps. I bought Camera Zoom FX a while back when it was on sale for 10 cents, and it works fine for me (especially since the recent huge update it received.)

    The only oddity I've really encountered has been getting text notifications from Handcent SMS. Every once in a while I don't get a notification, but it doesn't happen enough to worry me. And I check the app often enough, anyway, that it isn't like I would go for a day or two with no idea someone texted me.

    One thing to make a note of is that CM10 does not include the basic Google apps. You'll need to download them seperately, boot to recovery, and flash them on (just like you would flashing a ROM, except that you're only flashing some apps.) You can download it from here:
  18. Thread Author  Thread Author    #18  
    Caleb Morris's Avatar

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    Default Re: Unlocked bootloader, S-Off, AOSP explanation

    I have one last question for you all: is there a way to get S-Off with a 64bit system? That's all my laptop will run and all the S-Off method I have seen only run on 32bit systems

    Sent from my EVO using Android Central Forums
  19. #19  
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    Default Re: Unlocked bootloader, S-Off, AOSP explanation

    Quote Originally Posted by Cmorris8848 View Post
    I have one last question for you all: is there a way to get S-Off with a 64bit system? That's all my laptop will run and all the S-Off method I have seen only run on 32bit systems

    Sent from my EVO using Android Central Forums
    Yes in post 12 you can make a bootable 32 bit live cd or flash drive and boot into that, run the program to go s-off and when you reboot your pc take the disk out or flash drive and it will boot into windows. you dont need to install anything on your pc

    Unlocked bootloader, S-Off, AOSP explanation



  20. Thread Author  Thread Author    #20  
    Caleb Morris's Avatar

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    Default Re: Unlocked bootloader, S-Off, AOSP explanation

    One last question...again. I just did the HTC EVO hacks to unlock bootloader. So I am S-ON with unlocked bootloader. Am I able to nandroid even with S-ON?
  21. #21  
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    Default Re: Unlocked bootloader, S-Off, AOSP explanation

    You should be Able to. As far As I recall it only requires root access.

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  22. #22  
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    Default Re: Unlocked bootloader, S-Off, AOSP explanation

    Quote Originally Posted by Cmorris8848 View Post
    One last question...again. I just did the HTC EVO hacks to unlock bootloader. So I am S-ON with unlocked bootloader. Am I able to nandroid even with S-ON?
    Yes you can but you will need to install a recovery first. I recommend no root required
    Root is for the operating system, it allows access to your system files so you can make changes to them. which if you install a custom rom it will have root included



  23. Thread Author  Thread Author    #23  
    Caleb Morris's Avatar

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    Default Re: Unlocked bootloader, S-Off, AOSP explanation

    Quote Originally Posted by benny3 View Post
    Yes you can but you will need to install a recovery first. I recommend no root required
    Root is for the operating system, it allows access to your system files so you can make changes to them. which if you install a custom rom it will have root included
    I uses the HTC EVO hacks method which details how to install a custom recovery. So I am already on TWRP

    Sent from my EVO using Android Central Forums

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