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

by Mayur on November 14, 2012

in Android, How To's

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:

14-11-2012 22-26-29

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:

14-11-2012 22-31-26

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

14-11-2012 13-34-42

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.

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{ 67 comments… read them below or add one }

JPB November 15, 2012 at 3:52 am

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


Blake November 15, 2012 at 12:00 pm

Worked wonderfully! Thanks for the tutorial!


Sammyz November 15, 2012 at 4:12 pm

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


pjo November 15, 2012 at 6:48 pm

It works nice :) Thanks


Kevin November 16, 2012 at 3:41 am

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


usama November 16, 2012 at 5:31 pm

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)


Mayur November 16, 2012 at 7:34 pm

This doesn’t root your device. This manual way works 100% and is pretty easier too, just do everything as said.


sh0nuff November 16, 2012 at 8:06 pm

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?



Mayur November 16, 2012 at 9:10 pm

Updated the link.


Bill Thwaites November 17, 2012 at 4:05 am

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 November 22, 2012 at 8:36 pm

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


SR November 18, 2012 at 2:33 am

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


Brad November 18, 2012 at 5:07 am

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.


Mathan November 18, 2012 at 7:52 am

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.


Mathan November 18, 2012 at 8:25 am

Also let me know the easiest way to change. I am not a mobile geek.


Mayur November 18, 2012 at 1:58 pm

Yes, this is also an easy way if done as stated.


usama November 19, 2012 at 4:57 am

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


usama November 19, 2012 at 5:01 am

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 :(


Mayur November 19, 2012 at 5:41 pm

Try rebooting your phone into safe mode and see if that solves the problem. To to so, tap the ‘Power off’ option for a while and press Ok.


usama November 19, 2012 at 5:28 pm

Some help please Mayur!!!!!


Jacob November 20, 2012 at 1:38 am

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?


Billa November 20, 2012 at 7:31 pm

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


Mayur November 20, 2012 at 8:18 pm

Should possibly work but we haven’t tried it on Vista.


bensonpode November 20, 2012 at 10:08 pm

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


Ratnakar Vellanki November 20, 2012 at 10:43 pm

Awesome ! works like a charm !!


ganesh November 21, 2012 at 1:13 pm

thnx working perfectly…


ganesh November 21, 2012 at 1:14 pm

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


Imran November 21, 2012 at 7:09 pm

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


Mayur November 21, 2012 at 8:03 pm

Similarly run the command fastboot oem lock in CMD to lock the bootloader.


Imran November 24, 2012 at 1:43 pm

Hi, I have Tablet from Bharti Beetel Magiq with Android 2.3 build, i want it rooted with Android 4.1 or 4.2, can you please help in this matter and my GN is working perfectly fine after following your above steps.


bikram rai November 22, 2012 at 8:27 pm

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


Nitin_jain November 22, 2012 at 10:02 pm

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!


Nitin_jain November 22, 2012 at 10:20 pm

Moreover when i unlocked the bootloader the data didn’t get wiped


Mayur November 22, 2012 at 10:40 pm

Will be uploading a video about the extraction part soon. :)


bikram rai November 23, 2012 at 4:56 am

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.


Mayur November 23, 2012 at 10:32 am
bikram rai November 23, 2012 at 2:31 pm

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.


Jeff Jameson November 25, 2012 at 3:29 am

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



Manu November 25, 2012 at 2:06 pm

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.


lakishetty November 28, 2012 at 4:19 pm

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


Mufti December 8, 2012 at 11:45 pm

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.


Mack Tr?n December 18, 2012 at 10:23 am

Yeehee, THanks Mayur. You made my day!


Pratik December 18, 2012 at 11:10 am

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


Mayur December 19, 2012 at 7:33 pm

Yes, on any GSM Galaxy Nexus running any Android version regardless of yakjuxw, yakju or takju.


Nitin_jain December 18, 2012 at 3:38 pm

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!


Mayur December 18, 2012 at 8:46 pm

Yes, just flash 4.1.2 image using the toolkit.


Nitin_jain December 19, 2012 at 8:57 am

No i meant installing manually, just as above. I don’t know how to use the toolkit


Mayur December 19, 2012 at 12:39 pm

Yes, just download and extract the image. Then flash it manually, make sure to change the .img file name in command.


Nitin_jain December 19, 2012 at 9:06 am

project butter don’t seem to exist and battery is draining out very quickly


Sami December 25, 2012 at 1:38 am

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.


Pratik December 28, 2012 at 2:40 pm

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

plz reply asap….


Pratik January 2, 2013 at 11:05 am

Awaiting reply on this…plzzzz..


Venky December 30, 2012 at 10:18 pm

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


Mayur December 31, 2012 at 5:16 pm

Link fixed.


Venky January 1, 2013 at 3:51 am

Thanks a lot Mayur!! My GN is now running 4.2.1 :)


YOGESH January 2, 2013 at 9:09 pm

Dear Mayur

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


reyrodriguez January 6, 2013 at 8:14 am

hermano ese tutorial me sirve para mi nexus jakjuux? gracias


Faiz January 6, 2013 at 7:00 pm

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..


shar January 12, 2013 at 7:38 pm

thank youuuu……worked like charm……very useful


jo2 January 14, 2013 at 4:38 am

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 March 12, 2013 at 8:41 pm

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 ?


imran January 20, 2013 at 2:42 am

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


Nithin January 22, 2013 at 10:32 am

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


Prabhu February 16, 2013 at 1:08 pm

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 :)


Pratik February 23, 2013 at 10:23 am

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.



Vishal Fondekar April 17, 2013 at 3:40 pm

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


aditya August 31, 2013 at 12:46 pm

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


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