Android 5.0 Lollipop official factory image LRX210 can now be manually flashed to the LG Nexus 5 without any root access needed. It brings Project Volta, Material Design and Android Runtime to the Nexus 5 smartphone.

Requirements:

1. Use this to the unlocked variant of LG Nexus 5. Compatibility to Nexus 5 from network carriers is unknown.

2. Create a manual backup of all data files stored on the smartphone.

3. Unlock the boot loader before proceeding.

4. Battery level should be at least 80 per cent to prevent power interruption during the installation.

5. Enable USB debugging mode on LG Nexus 5.

6. Download and install the necessary USB drivers on the computer.

7. Download and set up the ADB and Fastboot with Android SDK on the computer.

8. Download the official factory image of Android 5.0 Lollipop LRX210 hammerhead-lrx21o-factory-01315e08.tgz for LG Nexus 5 on the computer.

Warning: We are not responsible for any issues that may occur on your LG Nexus 5. Download and install the necessary files to avoid damaging the smartphone. Do this at your own risk.

Flashing Instructions:

1. Connect the LG Nexus 5 to the computer using a USB cable.

2. Make sure that the Fastboot has been configured properly.

3. Switch off the LG Nexus 5 smartphone.

4. Reboot into Boot loader Mode by pressing and holding the Volume Up, Volume Down and Power keys at the same time until the Fastboot menu and "START" appears on the display screen.

5. On the computer, extract the contents from the downloaded firmware zip file to an easy location such as the desktop.

6. Open the hammerhead-lrx21o-factory-01315e08.tgz folder then copy and paste all contents to the Fastboot directory. By default, the Fastboot directory should be platform-tools folder inside the Android SDK folder.

7. Run the factory image files inside the Fastboot directory appropriate to the OS running on the computer.

a. Windows OS: Run the flash-all.bat file.

b. MAC OS: Run the flash-all.sh using the Terminal.

c. Linux OS: Run the flash-all.sh file.

8. Allow the installation to proceed on the LG Nexus 5 and follow other instructions on the display screen if the Bootloader has not been unlocked yet.

9. Once the installation has been completed, LG Nexus 5 will reboot automatically which may take up to five minutes before reaching the home screen.

For any bugs or issues, please send your feedback to the official thread of Team Android and check the guidelines at XDA Developer Forum as well for flashing the factory image.