Flashing a custom rom on Nexus 4

Flashing a custom image on an Android mobile could be just fun. But if you don't know why you want to do it, or do it just because it's a challenge. Then don't!

The bad and the good

I'm only pointing out some of the cons and the pros here.

Negative sides

  • An OS image could contain malware; only use community trusted images.
  • If you don't pay attention you can get malware running as root. That's B A D !
  • May not have all the phones vendor functionality.
  • The image may be buggy.

Consequences of a buggy image

  • Lock up your phone when you least expect it.
  • Drain the battery quicker.
  • Suddenly reboot.

Positive sides

  • You can get a newer more secure operating system.
  • Use less battery.
  • No crapware.
  • Extra security functions.

Flashing CyanogenMod

One of the custom Android images based on AOSP is CyanogenMod. As I know, it's one of the more used ones. Quite stable if you keep away from the nightlies and rich on functionality but not bloated.

Preparations

  1. Install adb and fastboot to help manage your Nexus phone.

    sudo apt-get install android-tools-adb android-tools-fastboot
    
  2. Download custom a recovery image. Personally I prefer ClockworkMod and the touch recovery. Note, this image is compiled for the Nexus 4 phone. Other phones use other images.

    wget http://download2.clockworkmod.com/recoveries/recovery-clockwork-touch-6.0.4.7-mako.img
    
  3. Download the latest M snapshot from CyanogenMod on download.cyanogenmod.org. The model name for Nexus 4 is mako.

    wget http://download.cyanogenmod.org/get/jenkins/67695/cm-11-20140504-SNAPSHOT-M6-mako.zip
    
  4. Download Google Apps from a trusted source. Again I prefer CyanogenMod as source and download from wiki.cyanogenmod.org.

    wget http://itvends.com/gapps/gapps-kk-20140105-signed.zip
    
  5. And to be on the safe side. Download the origian Nexus 4 firmware from Googles page Factory Images for Nexus Devices. Just in case... And if it is the case, untar the file and read the included instructions.

    wget https://dl.google.com/dl/android/aosp/occam-kot49h-factory-02e344de.tgz
    

Doing the deed

This is notes for my personal use. If you decide to go through with this I don't take any responsibility for any bricked or damaged devices.

1. Enable USB debugging on Android

  • SettingsAbout phone.

    Press repeatedly on Build number until you become a developer.

  • SettingsDeveloper options.

    Check USB debugging.

2. Unlock bootloader

  • Connect phone to computer with USB cable.

  • Check that the cable is usable by listing devices with adb. If you don't get any response. Change the cable and try again. The last cable could be a cheep charger cable without data wires.

    adb devices
    
  • Reboot phone into bootloader.

    adb reboot bootloader
    
  • Check that you get connection with fastboot.

    fastboot devices
    
  • Unlock your bootloader. This takes some time while the phone is erasing all data.

    fastboot oem unlock
    
  • Choose Yes on phone by pressing Volume up, and then accept by pressing Power.

3. Flash and enter recovery

  • Flash recovery image.

    fastboot flash recovery recovery-clockwork-touch-6.0.4.7-mako.img
    
  • Enter recovery image by pressing Volume up until Recovery mode is shown on top of screen. Press Power to enter the recovery image.

4. Prepare and install CyanogenMod

  • In ClockworkMod Recovery enter mounts and storageformat /system. Yes - Format.

  • In ClockworkMod Recovery enter mounts and storageformat /data and /data/media (/sdcard). Yes - Format.

  • Check the partitions is OK by going back to main menu and choose wipe data/factory reset and Yes - Wipe all user data. Check that you don't get any errors on formatting /data.

  • Choose install zipchoose zip from sideload and sideload CyanogenMod.

    adb sideload cm-11-20140504-SNAPSHOT-M6-mako.zip
    
  • Then sideload gapps. Select again choose zip from sideload.

    adb sideload gapps-kk-20140105-signed.zip
    
  • Just be on the safe side, go back and choose wipe data/factory reset and Yes - Wipe all user data.

  • reboot system now. First boot takes some time, be patient.

If you get problems booting into a clean system, I've read that another factory reset could do the trick.

5. Encrypt or not

After installing the phone you can choose to encrypt it or not. I like to encrypt my device with a passphrase. It's my data so why give it away if the phone get stolen; encryption makes it a bit harder for the bad guys.

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