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.

  • 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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  • Mike

    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.

  • mike

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

    • Pradeep Neela


  • kiang

    Hi Neal,

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

    Thanks a lot!

    • NeaL Pradeep


  • boyot

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

  • Ivo

    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?


    • NeaL Pradeep

      yes you can apply this update!

  • Hemal

    Hello Neal.

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

    • Pradeep Neela

      no you cannot!

  • David

    how to adjust the Semaphore room?

    • NeaL Pradeep

      Use Voodoo Control app!

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  • Kevin

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

    • Kevin

      If I install this , do I have to clear Dalvik Cache? and please tell me what Dalvik Cache does?

      • Pradeep Neela

        its actually a type of cache file which gets settled in the phone!

    • Pradeep Neela


  • mohammad

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

    • NeaL Pradeep

      you need to install voodoo too!

  • mohammad

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

  • Masakyo

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

    • NeaL Pradeep

      yes but you need to be on stock xxjvt firmware!

  • Masakyo

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

  • Masakyo

    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. :)-

    • NeaL Pradeep

      no not as of now!

  • Masakyo

    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?

    • NeaL Pradeep

      no it only works in Stock XXJVT!

  • keith

    This onli supports on gingerbread?

    • NeaL Pradeep

      yes keith

  • keith

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

    • Keith

      Here again, its all done. COOL SYSTEM ! This WEBSITE IS AWESOME !

    • NeaL Pradeep

      you can make use of voodoo app! follow this article!

  • Jaspreet

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

    • NeaL Pradeep

      you can install this semaphore kernel and then you can install the voodoo!

  • Arvin

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

    • NeaL Pradeep

      it all depends on your usage and customization!

  • Jaspreet

    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……..!!!

    • NeaL Pradeep

      please follow the instructions, you need to first update to xxjvt!

  • Arvin

    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?

    • NeaL Pradeep


  • abbas

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

    • NeaL Pradeep

      yes backup is the must!

  • Sharks

    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.


  • Sharks

    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.

    • NeaL Pradeep

      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!

  • Mihai

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

  • Mihai

    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

  • Albert

    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?

  • ratul

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

    • NeaL Pradeep

      we will soon come up with the procedure for installation of speed mod kernel!

  • Jarvis

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

    • Rash

      As it clearly states as above for SGSI9000, ONLY

  • gigidel

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

    • Mahmud Koya

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

  • Ghamaraj Luitel

    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.

  • gigidel

    does it support arabic or persian?

    • NeaL Pradeep

      No, not as of now!

  • Amith

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