Replicant

h1. Galaxy Nexus (I9250) Installation

*Warning: installing an operating system, such as Replicant, may void your device's warranty and will erase the data stored on the device.*

h2. Prerequisites

In order to install Replicant on your device, it is assumed that you have a computer running a GNU/Linux operating system and everything necessary to connect your device to the computer through USB available. Moreover, it is assumed that anyone performing the installation knows how to use command lines in a terminal and has basic knowledge about it.

h2. Before the installation

Some preliminary steps may be necessary to achieve best compatibility with your device. These steps may require more advanced technical skills than the rest of the process: make sure you know what you are doing!

h3. Saving the modified nv_data.bin

If your device was *SIM-unlocked* (using a code or another procedure), you must keep the nv_data.bin file from your current installation. Assuming @adb@ is enabled on the device and installed on the computer, open a terminal and run the following commands:

<pre>

adb shell busybox mount -o remount,rw /factory

adb pull /factory/

adb shell "cat /data/radio/nv_data.bin > /factory/nv_data.bin"

adb shell "cat /data/radio/nv_data.bin.md5 > /factory/nv_data.bin.md5"

</pre>

This will create a copy of the contents of @/factory@ in the current directory. Keep these files around as a backup in case anything goes wrong with @nv_data.bin@.

h2. Downloading the files

The first step in the installation process is to download and set up the files that will be used to install Replicant to the device. The files must be downloaded on your computer first.

1. Find out what the latest image is: check out the @Last image@ part of the general table on [[GalaxyNexus]]

2. Download *all* the files listed for the device (including the checksum) on [[ReplicantImages]] for the latest image

3. Download the @fastboot@ utility: jump to the @base URL@ of the latest image release (on [[ReplicantImages]]) and get @fastboot@ from the @tools/@ directory.

As @fastboot@ is built as a 32 bit binary, you will need to install compatibility libraries for 32 bits executables if your computer is running on a 64 bit architecture.

4. Make sure @fastboot@ can be executed: open a terminal in the folder containing @fastboot@ and run:

<pre>

chmod a+x fastboot

</pre>

h2. Preparing the device

The next step in the installation process is to prepare the device for @fastboot@ mode.

1. Make sure the device is completely turned off and the USB cable is disconnected from the device

2. Start the device by holding the following key combination: *Volume down, Volume up, Power*

3. Hold the key combination until the device shows *Fastboot mode*

4. Connect the USB cable to both the computer and the device

h3. Unlocking the bootloader

If this is the first time you are flashing an operating system to your device, you'll have to unlock it first. If this is not the case, you can skip that part.

*Beware: all data stored on the internal storage will be lost during that operation.*

1. Open a terminal in the folder containing @fastboot@ and run:

<pre>

sudo ./fastboot oem unlock

</pre>

2. Confirm that you want to unlock the device (using the volume keys to navigate and the power key to select)

h2. Installing the images

Now that both the computer and the device are set up, it is time to actually install the images to the device.

1. Open a terminal in the folder containing @fastboot@ and run:

<pre>

sudo ./fastboot flash boot path/to/boot.img

sudo ./fastboot flash recovery path/to/recovery.img

sudo ./fastboot flash system path/to/system.img

sudo ./fastboot flash userdata path/to/userdata.img

sudo ./fastboot erase cache

</pre>

Note: @path/to/boot.img@ refers to the path to the @boot.img@ file. If you downloaded @fastboot@ and the images in the same directory, you can replace @path/to/boot.img@ with @boot.img@. Same goes for @recovery@, @system@ and @userdata@.

2. If everything went well (@fastboot@ should indicate an error is something went wrong), you can reboot your device:

<pre>

sudo ./fastboot reboot

</pre>

*Your device should now be running Replicant!*