Galaxy S I9000 – Overclock & Increase Volume by 300% with Semaphore Kernel on XXJVT 2.3.5

Semaphore KernelOne of the highest Selling smart phone ever by Samsung and most customizable phone of the lot when it comes to the availability of the custom ROM firmwares, yes you have guessed it right its none other than the mighty Samsung Galaxy S GT I9000. So, it was the last time when we saw on how you can easily install the latest version of Gingerbread 2.3.5 firmware and now in this article we will see on how you can easily update your phone with the most powerful ever custom kernel which is called as the Semaphore kernel.

This update comes as a fix for all those who were experiencing issues even after installing the latest version of Gingerbread 2.3.5 version of firmware. This kernel comes with a host of advantages to wrap it up in short, this kernel will empower your Samsung Galaxy S GT I9000 with the following benefits:

Over Clocking facility: With the help of this Semaphore Kernel you can easily and safely over clock the processor speed to speed / clock new highs when it comes to the processing speeds. You can also measure the clocking speeds with the help of the benchmarking tool called the Antutu tool and also this gives rise to the higher quadrant ranks for better performance than ever.

Voodoo Sound Control:
When you will be updating with this kernel which we will see in the due course of the time, you will be able to experience up to 300% higher volume than what you currently hear in your headphones providing you a louder music even when compared with the Apple iPhone or say iPods. This Voodoo Sound control capability comes by default with this kernel.

Color temperature:
With the help of this Semaphore ROM you will be easily able to increase / decrease / modify the color temperatures which you see in your Samsung Galaxy S GT I9000 and can experience the Bravia engine kind of experience which is the proprietary of the Sony Electronics.

Pre Requisites before flashing Semaphore kernel

  • So after following the pre requisites from the above link, you now will have to proceed to follow the instructions in the next page. Please note that it’s very important to ensure that you are on XXJVT 2.3.5 Gingerbread firmware, you can find the same from the path Settings > About Phone > Firmware Version where you will find the version of Android OS where it will show XXJVT 2.3.5. If it doesn’t show this version then you will have to update the same from the below link,

Procedure to update Samsung Galaxy S with XXJVT 2.3.5 Gingerbread

  • Ensure that the phone is charged with the minimum of 60% so as to just ensure that the phone doesn’t get turned Off in the process of the Kernel installation.
  • Please note that in this process you need to disable any Voodoo lag fixes if applied from the recovery mode or else it will brick your phone. The recovery mode can be entered by pressing  Volume UP on Volume Down Key + OK button, and holding both simultaneously press the Power Button. You can refer the below mentioned video on how you can enter into the recovery mode. In the recovery mode, select Wipe data/factory reset and also you need to select Wipe Cache partition and then reboot your device by selecting reboot system now option.


  1. não quero spam

    are you an idiot? 300% more volume is useless if the sound quality isn’t there. only and idiot would care about loud music and not quality.
    also, color temperature is not a “sony bravia” thing. it’s a light thing. any light.

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  3. Galaxy S I9000 – Overclock & Increase Volume by 300% with Semaphore Kernel on XXJVT 2.3.5 : Android Advices Very nice post. I just stumbled upon your blog and wanted to say that I’ve truly enjoyed surfing around your blog posts. After all I will be subscribing to your rss feed and I hope you write again very soon!

  4. I just replaced a older kernel for this one and wow! It’s so much faster. I just used SGS Kernel Flasher instead of Odin and it only took about 2mins to do. Thanks for the great work.

  5. hey to flash xxjvu i need to remove this right???so how do i do that???

  6. Hi Neal,

    Do you know what’s the safest overclock speed for I9000? and what tool to use for this?

    Thanks a lot!

  7. my phone gone blank once ODIN is at \ zImage\ stage
    …you said it takes about 5 mins…but mine gone blank for 10 mins…

  8. Hi Neal,
    I add this version of kernel to my xxjvt, can I now upgrade semaphore with higher version (1.9, 2.0, 2.1) with this procedure?


  9. Hello Neal.

    Can I update on 2.3.6 xwjvx. If yes than how it can update ?

  10. how to adjust the Semaphore room?

  11. An fascinating word is couturier annotate. I cerebrate that you should create more on this matter, it strength not be a prejudice soul but generally people are not enough to utter on specified topics. To the next. Cheers like your Galaxy S I9000 – Overclock & Increase Volume by 300% with Semaphore Kernel on XXJVT 2.3.5 | Android Advices.

  12. Hello Neal
    I already installed xxjvt 2.3.5 firmware, rooted, and also installed Force Close & Performance Fix. Can I installed this one?

  13. I have installed the kernel but the sound didnt icrease at all so how can i increase it?
    help please

  14. should i root my phone first or not?
    reply as fast as you can please

  15. No fix for this? What other kernels can I use on XXJVT which supports Voodoo Sound Control free version?

  16. Gone back to XXJVT now, rooted and loaded semaphore. lemme try it out n see. will comment l8r.

  17. Is there any other way to increase volume in CM7.1? I don’t really need a 300% volume increase but a healthy 20% would be nice. :)-

  18. I was on XXJVT when I flashed CM7.1 Stable rom. Now my Baseband version is I9000XXJVK. I’m quite keen on the ‘Volume increase’ feature. Will this work on my CM7.1 or do I need to go back to XXJVT? Neal?

  19. This onli supports on gingerbread?

  20. How do i go into setting my volume higher? is there any guide?

  21. already on 2.3.5 semaphore …. how to install voodoo lag fix…………?????

  22. Is it safe to overclock my phone? Can you post a tutorial on how to do it?

  23. brother i have done all this semaphore stuff and still getting low quadrant benchmark of about 2000 something…….even at 1.2 ghz …… i saw a guys video at youtube he got 3000+ marks at default 1ghz

    but he was using semaphore with voodoo lagfix……….tell us can i use the voodoo lagfix at this firmware also at 2.3.5 xxjvt……..

    i saw ur article but that voodoo lagfix was for 2.2.1…..

    can i install it now also in rooted 2.3.5xxjvt semaphore ……?????

    waiting answer quickly……..!!!

  24. Can voodoo control plus fix my Bose OE2i problems. I can’t use my headphones. Can somebody answer me, how to fix it? Can this app fix it?

  25. do i have to backup my contacts and apps before installin this KERNEL??????

  26. Well done Neal, I am happy with the Samsung Rom at the moment with this Semphore kernel I have just flashed brilliant. Please advise me how I can put lagfix on so i its runs even better.


  27. Hi Neal,
    First of all let me tell you friend, your site is fab and I have just updated my Galaxy S, after having numerous problem with it.

    I have fallowed your advise to t from here and thanks to you now I have Galaxy S XXJVT and rooted as well. Every thing seems to be running fine. Specially all the familiar stuff like Swype and Samsung Market App. My question is why do I have issue of lagging sometime specially when I am using Go launcher and some teething problems with my apps and today I had major issue with my stock dial pad which did not ring out and I had to reboot 3 times.

    Please advise would this kernel sort this problem out as well as make my phone Zippy. Would I still have the swype and other Samsung Stock rom fav. Is this Kernel similar to CynaogenMod7.1 as I have been told that this rom has similar feature of overclocking as well Increasing volume. Would appreciate if you can advise the stability as well as how good is this kernel compare to any other custom Rom.

    Thanks in advance for all your technical ability for Android community and look forward to hearing from you very soon.

    • XXJVT is btteer one as of now as it has improved modem and improved features like over scroll glow and other tweaks in internet broser in terms of flash. Custom ROMs are try and keep kind of thing, it all depends on the individual likings as every custom rom has additional utilities and User interface, so i would request you to update by checking out the respective screen captures of the custom roms which we have covered as we also mention the screen captures in the custom rom articles!

  28. Until now this version is qiute stable, but the battery drains out more quicly than XXJVR: ~12h comparing to 2 days.

  29. I have installed XXJVT, root and Semaphore. It seems to work fine until now (only 2 days old).
    But when I move the apps from phone to SD the app size become smallest (e.g. ExtensiveNoteLite from 4.00Mo -> 2.04Mo); this happens to all apps I have checked; they seems to still work with this small size. Does anybody know what happens ? Thanks

  30. I have the I9000 and installed the upgrade as described. When I installed the Semaphore kernal update the internet is now almost at a standstill, the app market and other data dependant items will timeout.
    Is there anything I can do/ settings that I need to change?

  31. i have installed this semaphore kernel……but now i want to install speedMOD kernel……how to do that ?

  32. Will it work for Samsung Galaxy S GT i9003???

  33. how install arabic language on this firmware? my base language is english just i want to read sms or mail arabic or persian.

    • Hi gigidel,
      You can download an application ‘Arabic reader’ from the Market Place and install just to read Arabic sms.

  34. Hi Neal,
    I have upgraded with Ice Cream Sandwich Candy Amestris 5.1 Custom ROM on XXJVT in my GT I9000.

    Please give me suggestion, can I update it remaining Ice Cream Sandwich Candy Amestris 5.1 Custom ROM?
    Thank you.

  35. does it support arabic or persian?

  36. When will the voodoo lagfix or any file system conversion hit xxjvt???