Update Nexus without losing data


Depend on several things OTA updates fails on your rooted devices or you want to manually  upgrade your android.

Download the factory image of your Nexus from:

https://developers.google.com/android/nexus/images

Extract the archive and edit the flash-all file (.bat if you are under Windows or .sh if you are under Linux).

 

You have to remove the “-w” option from the command on line 23:

fastboot -w update image-....

It will become:

fastboot update image-.....

Reboot in fastboot mode with:

 adb reboot bootloader

And then you can run the flash-all script.

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