Convert Stock Yakju 4.1.2 to Stock Takju 4.2 without loosing data/apps

freezer2000 · Nov 16, 2012

Are you a Galaxy Nexus (yakju) user and waiting for the 4.2 OTA update while the same has been pushed for Takju variant... please follow below to convert from yakju to takju (stock) without loosing your data/apps: (assuming you know adb & fastboot and have set them up on your computer. Also assuming that bootloader is unlocked) [Please read before you implement]

1. Download the 4.2 factory images for Takju from http://goo.gl/UMbmS
2. Extract files using 7-zip on Windows (you need to extract twice and will get the files as: bootloader-xxx.img; radio-xxx.img and image-xxx.zip)
3. Copy these files to the location android-sdk/platform-tools/ (if you have the android-sdk installed or to the location where adb & fastboot is)
4. Plug in your Galaxy Nexus (ensure Debug option is enabled under Developer Settings
5. Follow these commands:
a. adb reboot bootloader
b. fastboot flash bootloader bootloader-xxx.img
c. fastboot reboot-bootloader
d. fastboot flash radio radio-xxx.img
e. fastboot reboot-bootloader
f. fastboot update image-xxx.zip

This would update your Galaxy Nexus from Stock 4.1.2 (yakju) to Stock 4.2 (takju) without losing any data/apps

Note:
1. If you using Windows follow the video tutorial to setup adb and fastboot http://goo.gl/jGcic
2. If you are on Mac, use ./ before the commands for execution

Note 2: With this method you don't need to remove the userdata.img as the command "fastboot update image-xxx.zip" does not touch the userdata on your device.

*Disclaimer: I have followed the above to the T and moved from Stock 4.1.2 (yakju) to Stock 4.2 (takju) with Unlocked Bootloader, but you follow these at your own risk.

Hit Thanks, if this has helped you.

neelabh75 · Nov 16, 2012

Why are you using crespo images instead of maguro?

yxcv99 · Nov 16, 2012

ROFLCOPTER. Say thanks for copy paste and already posted o0

neelabh75 · Nov 16, 2012

I understand that you are avoiding userdata cause it will wipe the existing one. But if one does not flash the boot image, will the next OTA(if ever happens) will be successfully installed?

freezer2000 · Nov 16, 2012

neelabh75 said:
I understand that you are avoiding userdata cause it will wipe the existing one. But if one does not flash the boot image, will the next OTA(if ever happens) will be successfully installed?

This should allow you to update the next OTA without any issues..

paganwinter · Nov 16, 2012

Code:

fastboot update image-xxx.zip

This will almost definitely wipe the data, as image-xxx.zip contains userdata.img
Every other place I have read instructions, they have mentioned that userdata.img must be removed from image-xxx.zip before updating it.

taylerdurden · Nov 16, 2012

To do this you have to have the bootloader UNLOCKED. In the bootloader unlock process, all your data will be wiped, so this guide

DOESN´T WORK

Samhain77 · Nov 16, 2012

paganwinter said:
Code:

fastboot update image-xxx.zip

This will almost definitely wipe the data, as image-xxx.zip contains userdata.img
Every other place I have read instructions, they have mentioned that userdata.img must be removed from image-xxx.zip before updating it.

Sure you're righrt, you've to remove it from the zip file. This guide is not so useful as it should be.
By the way to perform all this actions you need unlocked bootloader, if you haven't yet you will LOSE ALL YOUR DATA when unlocking with: fastboot oem unlock

freezer2000 · Nov 16, 2012

yxcv99 said:
ROFLCOPTER. Say thanks for copy paste and already posted o0

Thanks for your comment.
At least I made you laugh... Have a Good Day

buggerman · Nov 16, 2012

paganwinter said:
Code:

fastboot update image-xxx.zip

This will almost definitely wipe the data, as image-xxx.zip contains userdata.img
Every other place I have read instructions, they have mentioned that userdata.img must be removed from image-xxx.zip before updating it.

Yup.. You MUST remove userdata.img..

freezer2000 · Nov 16, 2012

Samhain77 said:
Sure you're righrt, you've to remove it from the zip file. This guide is not so useful as it should be.
By the way to perform all this actions you need unlocked bootloader, if you haven't yet you will LOSE ALL YOUR DATA when unlocking with: fastboot oem unlock

That's correct unlocking the bootloader will result in loosing the data.

I should have mentioned that mentioned the assumption of the bootloader being unlocked in the first place. Will do the edit.

Thanks

paganwinter · Nov 16, 2012

Someone (freezer2000) better edit the post before some noobs go about unknowingly deleting their data!

Apart from that, anyone's got any idea what exactly is lost when the userdata.img is flashed? As in what exactly constitutes user data?

freezer2000 · Nov 16, 2012

paganwinter said:
Someone (freezer2000) better edit the post before some noobs go about unknowingly deleting their data!

Apart from that, anyone's got any idea what exactly is lost when the userdata.img is flashed? As in what exactly constitutes user data?

This is exact procedure followed by myself for mine and 4 other Galaxy Nexus's around me, without loosing any data. If that helps...

paganwinter · Nov 16, 2012

Good if it worked for you, but am still a little skeptical.

This seems to be a better guide:
http://xdaforums.com/showpost.php?p=32644145&postcount=10

freezer2000 · Nov 16, 2012

paganwinter said:
Good if it worked for you, but am still a little skeptical.

This seems to be a better guide:
http://xdaforums.com/showpost.php?p=32644145&postcount=10

If you look at the fastboot commands, the -w switch erases the userdata and cache

So, if you wish to do a complete format the command will look like this: fastboot update -w image-xxx.zip

paganwinter · Nov 16, 2012

freezer2000 said:
If you look at the fastboot commands, the -w switch erases the userdata and cache

So, if you wish to do a complete format the command will look like this: fastboot update -w image-xxx.zip

Seems like you're right about that...

Damn! Why am I still not doing it then!?

neelabh75 · Nov 16, 2012

Done!! It is updating now

Removed the userdata from image. Uploading it here if anyone want to use it.

---------- Post added at 10:49 AM ---------- Previous post was at 10:48 AM ----------

Looks like I am unable to upload file.

PS:- 4.2 is updated

Thanks!!

freezer2000 · Nov 16, 2012

neelabh75 said:
Done!! It is updating now Removed the userdata from image. Uploading it here if anyone want to use it.

---------- Post added at 10:49 AM ---------- Previous post was at 10:48 AM ----------

Looks like I am unable to upload file.

PS:- 4.2 is updated Thanks!!

Did you follow the same steps or actually removed the userdata.img before updating?

neelabh75 · Nov 16, 2012

freezer2000 said:
Did you follow the same steps or actually removed the userdata.img before updating?

I removed the userdata.img before updating

freezer2000 · Nov 16, 2012

neelabh75 said:
I removed the userdata.img before updating

Ah...a long route... for future use, you may directly update the factory images on the stock rom without actually removing the userdata.img as the command: fastboot update image-xxx.zip will not touch the userdata on the device.

To confirm this, type just fastboot at the command prompt or terminal to see the syntax.

Hope it helps...

Convert Stock Yakju 4.1.2 to Stock Takju 4.2 without loosing data/apps

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