Guide to Manually Install Android 4.2 Takju on Non-Yakju Galaxy Nexus

Following the availability of Nexus 4 and Nexus 10, Google has begun the rollout of Android 4.2 Jelly Bean OTA update for Galaxy Nexus and Nexus 7 as well. Android 4.2 is currently available only for Takju variant of GSM/HSPA+ Galaxy Nexus and luckily Google has also released the Android 4.2 factory image for Takju Galaxy Nexus. Apparently, Non-Yakju Galaxy Nexus users wont receive this new update anytime soon as their phone is updated by Samsung whereas Yakju & Takju firmware are updated directly by Google. However, users with adequate technical know-how can easily convert their non-yakju (yakjuxw, yakjuux, yakjusc, yakjuzs, yakjudv, yakjukr and yakjujp) device to Takju to receive prompt future OTA updates from Google.

Install Yakju or Takju? Takju, the firmware that ships with Google Play Store version of Galaxy Nexus (in US) apparently receives updates faster than the Yakju variant. So, it’s better to choose Takju over Yakju.


1. This process requires to unlock bootloader which Completely Wipes your device including /sdcard. So make a backup first.
2. Your Galaxy Nexus device name should be maguro (See how to check that)
3. This procedure is meant only for GSM/HSPA+ Galaxy Nexus.

Tutorial – Converting Yakjuxw (Non-Yakju/Yakju) Galaxy Nexus to Takju and updating to Official Android 4.2

Step 1 – This is an important step. You need to install and configure the ADB and Fastboot drivers on your Windows system. Refer our guide: New Method – Installing ADB and Fastboot Drivers for Galaxy Nexus on Windows 7 & Windows 8.

Step 2 – Take a backup of your installed apps (with data) and SD card contents. Check our article, [How to Backup Galaxy Nexus Apps & Data without Rooting]. Taking a backup of apps is optional but it’s recommended to manually backup your SD card data.


Step 3Download and Extract all the required files.

Download 4.2.1 (JOP40D) Official “Takju” factory Image (Direct Link)

– Extract the above .tar file to your desktop using an archive program like WinRAR. Then rename the file and add a .zip extension to it. Extract the file to a folder on your desktop. Then open the folder and extract the file ( to the same folder. Now you should see 6 files with an .img extension as shown in image below:

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Download Fastboot & ADB – Extract the zip, then copy and paste all the extracted files to the folder where all the 6 .img files are present, such that all the required files are placed in one single directory. Refer to image:

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Video tutorial for Step 3

Step 4 – Proceed with Unlocking Bootloader and Flashing Android 4.2

  • Turn off your phone. Then boot it into bootloader/fastboot mode by holding Volume Up + Volume Down key and power key simultaneously.
  • Connect the phone to computer using USB cable.
  • Now Right-click the folder ‘takju-jop40c’ while holding down the Shift key and click on ‘Open command window here’.

14-11-2012 22-40-04

  • Command prompt window will open up. Type fastboot devices to confirm that your device is recognized while it’s in fastboot mode.

Unlock Bootloader – Unlocking the bootloader will wipe the entire data on your device including SD card. So, make sure you’ve taken a backup of your important files.

In CMD, enter the command fastboot oem unlock .Then a screen titled ‘Unlock bootloader?’ will appear on your phone. Select ‘Yes’ to unlock (use volume keys to navigate and power key to make your selection.) The lock state should say Unlocked.


Flashing Android 4.2 Takju Manually

When your device is in fastboot mode, enter all the below commands step-by-step in stated order (use copy-paste in CMD to input the command).

Note: Make sure to wait for the “finished.” notification in CMD before entering the next command. The system.img and userdata.img file takes a big longer to flash.

fastboot flash bootloader bootloader-maguro-primelc03.img

fastboot reboot-bootloader

fastboot flash radio radio-maguro-i9250xxlh1.img

fastboot reboot-bootloader

fastboot flash system system.img

fastboot flash userdata userdata.img

fastboot flash boot boot.img

fastboot flash recovery recovery.img

fastboot erase cache

fastboot reboot

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That’s it! Your device should now boot up normally with the new Android 4.2 update and ‘Takju’ firmware that will offer faster updates directly from Google. 🙂

Disclaimer: Try this guide at your own risk! We wont be responsible in case your device gets bricked. This may also void your warranty.


Mayur Agarwal is the founder and editor-in-chief of WebTrickz. As a Technology enthusiast and an Internet addict, he loves sharing useful How To’s and Tips & Tricks. Follow him @mayurjango on Twitter where he is extremely active.

70 Responses

  1. JPB says:

    Thank you for your tutorial. My Yakju GNex is now Takju and it is currently updating to 4.2!!!!!!!

  2. Blake says:

    Worked wonderfully! Thanks for the tutorial!

  3. Sammyz says:

    Thank you for the ttutorial ! Its running awesum…………..

  4. pjo says:

    It works nice 🙂 Thanks

  5. Kevin says:

    Awesome…. super easy and worked great!!!! 4.2 on my yakjuux 😛

  6. usama says:

    Hello, can you please tell me if this will root my device or not?
    Secondly, is it better to do this manually or use the earlier method(toolkit), which is easier?(total noob)

  7. sh0nuff says:

    XDA link for the fastboot files no longer works. Tried to find them on the HTC site, no luck..

    Got a new link that works?


  8. Bill Thwaites says:

    You. Are. Amazing.


    These instruction rock! I had a bit of trouble figuring out the .tar / .tgz files but google helped. I am now rockin takju ha ha

    Thanks though

    • bikram rai says:

      how did you figure it out the .tar / .tgz files??/ and can you tell me how you put the cmd manually?? m stuck over there. plz help me someone. m dying to have 4.2 in my galaxy nexus

  9. SR says:

    Hey Mayur, worked perfectly :), thanks you made my day….:):)

  10. Brad says:

    I’m stuck at the CMD prompt. When I type fastboot oem unlock, I get a message saying . I never receive any message on my phone confirming I want to unlock the bootloader.

  11. Mathan says:

    my android version:4.1.1
    Product: yakujuxw
    Display: JR003CI9250XWLH2
    Device: maguro

    can I do the above said thing to convert my yakujuxw to Takju.

  12. usama says:

    Thank you sooo much man! Very easy even for a total noob.

  13. usama says:

    But I have two problems now, please help.
    Firstly I can’t receive any files through Bluetooth, my phone goes crazy and starts turning Bluetooth on and off, and a message appears saying it has stopped.
    Secondly when I connect my phone to my laptop(the one on which I updated my phone), it starts finding the drivers but doesn’t work. So I can’t connect my nexus to my laptop.
    Hope you can help me because its 5 am and I can’t sleep 🙁

  14. usama says:

    Some help please Mayur!!!!!

  15. Jacob says:

    Hi all,

    Can someone just compile all of this?

    I have a Yakju GN (rooted with CWM)

    I tried to follow this guide but I’m getting stuck on step 4

    I’ve used RootKit to check my drivers and they all seem to be OK, but it still won’t pick it up on bootloader.

    Any ideas?

  16. Billa says:

    Does the step:1 (installing ADB drivers) is the same for Windows Vista also??

  17. bensonpode says:

    how about the performance???any bugs or glitches???

  18. Ratnakar Vellanki says:

    Awesome ! works like a charm !!

  19. ganesh says:

    thnx working perfectly…

  20. ganesh says:

    Hey Mayur,
    I have one more phone htc wildfire a3333(unrooted)
    I want to update it….
    Plz help me…

  21. Imran says:

    Hi, i followed your step and guess what i updated my nexus to Jellybean 4.2 with Takju. now i need your help to locked my nexus. I booted my device with Fastboot and check it shows “UNLOCKED”. how to lock to get phone warranty back. I have download Nexus toolkit 1.5.5

  22. bikram rai says:

    while i’m stuck in this stage:
    Flashing Android 4.2 Takju Manually –

    When your device is in fastboot mode, enter all the below commands step-by-step in stated order (use copy-paste in CMD to input the command).

    Note: Make sure to wait for the “finished.” notification in CMD before entering the next command. The system.img and userdata.img file takes a big longer to flash.

    how to use copy-paste in cmd to input the command?? i m confuse over here. i put “fastboot flash bootloader bootloader-maguro-primelc03.img” and hit enter it say no path. if you have video to do this plz send me the link as soon as possible. i have also tried to do it by using “Easiest Way to Change Galaxy Nexus from Yakjuxw (Non-Yakju) to Android 4.2 Yakju/Takju and Get future Updates from Google” but i couldn’t download nexus root toolkit, when it reach to 240MB error came up. i have yakjuxw and i want to convert it into takju

  23. Nitin_jain says:

    Hey, i am a complete noob.I have a galaxy nexus yakjuxw 4.1.1. my bootloader is already unocked. shall i proceed with the above step. Moreover can you explain the first few steps about the unzipping part more clearly. Please help!

  24. bikram rai says:

    I did it. now my galaxy nexus is running on 4.2. everything is going smooth and well but there is one problem I.e. now in setting menu there is no developer option. how can I get that option? is it fine with out developer option or not? bcoz it contains many useful features like USB debugging and others.

  25. bikram rai says:

    dear mayur! its been like 8 hrs that I installed 4.2 takju in my GNx and now I m facing some problem. while I don’t know whether its problem with my phone or is it real that 4.2 have seriously bug issues.
    1. now while dailing the number the response of touch is slow which is really annoying me.
    2. now there is no more effect in camera setting like it used to be in the past ex. squeeze head, big nose, big mouth etc. also there is some problem with camera apps too.
    3. phone is now some what slower than before.

  26. Jeff Jameson says:

    Simplest tutorial on how to get Android 4.2 that actually works. No problems!


  27. Manu says:

    Hi Mayur, I bought a galaxy nexus on eBay india. I am having trouble in connecting to 2g/3g (E/G/H). It appears after every restart but then dis-appears. I am hoping it is due to some radio issues. It is a Maguro/yakjuxw version. Will updating to Yakju/Takju solve the radio problem ?? I am in desperate search for a solution after spending so much money on the phone. I guess this phone is originally from UK/Europe. I would be extremely grateful for any help.

  28. lakishetty says:

    Mayur….. You rock man…. Nice guide. Looking forward for some more tips and tricks from you

  29. Mufti says:

    Dear Mr. Mayur,
    The upgrade is working fine along with changing product (i.e. takju).

    //- Download 4.2 (JOP40C) Official “Takju” factory Image (Direct Link)//

    Google replaced 4.2.1 (JOP40D) instead of 4.2 (JOP40C). So, update the direct download link.

  30. Mack Tr?n says:

    Yeehee, THanks Mayur. You made my day!

  31. Pratik says:

    will this work on my samsung galaxy nexus
    running Android – 4.1.1
    Device – Maguro
    Brand – Samsung
    ID – JRO03C
    Product – Yakjuxw

  32. Nitin_jain says:

    Hey, very good post. I was able to do it easily. But i don’t like this update. My phone is no more snappy as it was earlier. I like the features of 4.2.1 but wish to roll it back to 4.1.2. Can the same procedure as above be used for the 4.1.2 binary. Please help!

  33. Sami says:

    Out of all the To-Dos I have come across in my life, I think this is the most beneficial one ever. Thank you so much. God bless.

  34. Pratik says:

    I have vista on my computer….anyone tried running the above procedure on vista?

    plz reply asap….

  35. Venky says:

    Hi. The direct link to download the Takju factory image doesn’t seem to work. Please help!!

  36. YOGESH says:

    Dear Mayur

    My nexus build is JRO03C.I9250XWLH2. CAN I APPLY THIS METHOD.

  37. reyrodriguez says:

    hermano ese tutorial me sirve para mi nexus jakjuux? gracias

  38. Faiz says:

    Hello… i already extract the takju factory image .. but there is just 4 file which is boot , recovery, system, userdata.. so after paste the command which is ”fastboot flash bootloader bootloader-maguro-primelc03.img”.. i got failed message..

  39. shar says:

    thank youuuu……worked like charm……very useful

  40. jo2 says:

    Thank you very much for this excellent guide !

    I had maguro Yakjuxw 4.1.1, and used this guide to install Takju 4.1.2, from Google:

    I chose the 4.1.2 just to see how long it would take to get OTA for 4.2. Which was a couple of minutes. And after having done that upgrade, the 4.2.1 arrived.

    Again – great guide and instructions 🙂


    • Valmir says:

      Jo2, im planning to convert my yakjuxw to takju and i would like to know if you are happy with the choice you made ? Did you recieve the 4.2.2 update? Any regrets ?

  41. imran says:

    i tried this procedure.
    failed to recognise my phone in fastboot for first time
    then in device manager i again updated drivers and it start WORKING

  42. Nithin says:

    Hey.. That was awesome.. Worked perfect… I am on Takju right now..

  43. Prabhu says:

    Excellent article. I used this to upgrade my wifes phone to 4.1.2. And the moment I connected to Wifi started receiving the 4.2.2 update from Google OTA 🙂

  44. Pratik says:

    Hi mayur….can you please tell whether this procedue would work on vista….

    Also, I found another guide from you:

    which one should i use…

    Awaiting reply eagerly…..TIA.


  45. Vishal Fondekar says:

    Can i relock my bootloader after converting GNEX yakju to Takju..??

  46. aditya says:

    hey brother my galaxy nexus bricked …now to fix it plz tell me..

  1. November 14, 2012

    […] New: Guide to Manually Install Android 4.2 Takju on Non-Yakju Galaxy Nexus […]

  2. November 16, 2012

    […] which will also wipe your device clean. Then follow these easy instructions to flash 4.2 Guide to Manually Install Android 4.2 Takju on Non-Yakju Galaxy Nexus Took me an hour or so since I had never done it before, but it worked perfectly, first time. PHone […]

  3. November 19, 2012

    […] – Guide to Manually Install Android 4.2 Takju on Non-Yakju/Yakju Galaxy Nexus and Get future Updates from […]

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