Android 5.0 Lollipop OTA update zip files now available for Nexus devices

Google has started rolling out the Android 5.0 Lollipop update to its Nexus lineup, and have also released the factory images for most of its Nexus devices. The Google Nexus 4, Nexus 5, Nexus 7 (2012), Nexus 7 (2013) and Nexus 10 are all expected to receive the OTA update, and you can download the update files using the following links:

The OTA update has just begun, so we will be updating this page as the files are made available. Please check back regularly if the update is not available for your device. Please only install update files that our compatible with your device.

• Nexus 4 (occam)
• 4.4.4 (KTU84P) > 5.0 (LRX21T)
• Nexus 5 (hammerhead)
• 4.4.4 (KTU84P) > 5.0 (LRX21O)
• 4.4.4 (KTU84Q) > 5.0 (LRX21O)
• Nexus 7 2013 WiFi (razor)
• 4.4.4 (KTU84P) > 5.0 (LRX21P)
• Nexus 7 2013 LTE
• (Coming Soon)
• Nexus 7 2012 WiFi (nakasi)
• 4.4.4 (KTU84P) > 5.0 (LRX21P)
• Nexus 7 2012 3G
• (Coming Soon)
• Nexus 10 (mantaray)
• 4.4.4 KTU84P > 5.0 (LRX21P)

The Google Nexus 9 and Nexus 6 are also receiving OTA updates, which bring bug fixes and performance improvements to both handsets.

• Nexus 6
• (Coming Soon)
• Nexus 9 (volantis)
• 5.0 (LRX21L) > 5.0 (LRX21Q)

How to install OTA zip files on your Nexus device

OTA updates are usually pushed out automatically to the Nexus device and you should receive a notification when the update is available for download on your device. The following guide will show you how to manually download and install these OTA files before the update is pushed through Google.

1. Download the OTA zip files for your device using the links above.
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2. If you have a custom recovery:
• copy the zip file to your device root folder
• reboot into custom recovery
• flash the zip file you downloaded
• reboot your device
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3. If you have a stock recovery
• Reboot your device and enter fastboot mode (power+Volume Up+ Volume Down) (or power+Volume Down)
• When you are in fastboot mode, press Volume Up until the word Start changes to Recovery. Then press  the Power button.
• When you see the Android with the exclamation mark, press VolumeUp+Power together and you will see a menu.
• Select update from adb from the menu.
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4. Connect your device to your computer using the USB cable
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5. Download and install the Android SDK on your computer. You can also download the required files only using the following links to save some time and space.
• Download for Mac
• Download for Windows
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6. If you have the SDK installed head over to \adt-bundle\sdk\platform-tools to access ADB/Fastboot. If you downloaded the files create a folder under C:\android and extract the ADB/Fastboot files into it.
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7. Copy the zip file from Step 1 into the same folder.
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8. Now open a command prompt (cmd in window, terminal in mac) and type the following
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9. You will see a message sending: sideload which will progress to 100%
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10. At this point the device will start installing the update.

source - XDA Devs