*Samsung* seems to have failed, rushing to put out an update to the "Volume-"-bug in their Galaxy Nexus.
They provided a wrong-signed Google+ and Google Maps app. They failed to update ("Wrong package signature", see [here](http://code.google.com/p/android/issues/detail?id=22435)).
To find out if your device has this broken firmware, check the build number: **ITL41F.I9250XWKK8** instead of just **ITL41F** (or **ITL41D**) is the broken one.
To flash the official firmware, do as follows:
- if you already set up everything on your device, you can make a backup:
- backup the internal settings using `adb backup -all -system -shared -apk` (enable *USB Debugging* first, under Windows you may have to install some drivers)
* this will create a file `backup.ab` with your data
* :warning: There was a bug in 4.0.1 which didn't backup `/mnt/sdcard` using adb. To fix this, manually backup the contents of `/mnt/sdcard` using a
tool like [FTPServer](https://play.google.com/store/apps/details?id=lutey.FTPServer), [WebSharing](https://play.google.com/store/apps/details?id=nextapp.websharing.r1) or similar
- download the official firmware from <http://code.google.com/android/nexus/images.html#yakju> (European devices are **yakju**, Verizon is **mysid**)
- download `fastboot` for Windows from <http://code.google.com/p/android-roms/downloads/detail?name=fastboot-win32.zip&can=2&q=>, for Linux try to find a binary package
- boot the phone into the bootloader (hold both volume keys and then hold the power key)
- use `fastboot` to flash the bootloader
-`fastboot reload-bootloader`
- use `fastboot` to flash the radio firmware
-`fastboot reload-bootloader`
- use `fastboot` to flash the main firmware (that ZIP file)
- if you really need an unlocked bootloader to easily update in the future, do it now: (it will be locked after update)
- boot into the bootloader
-`fastboot oem unlock`
- reboot
- to restore your backed up settings, do this:
- set up all previous Google- and eMail-accounts
- enable *USB Debugging*
- restore all internal data using `adb restore backup.ab`
- maybe: use FTPServer, WebSharing or similar to restore `/mnt/sdcard`
