Android 4.4 KitKatwould be rolling out to WiFi variants of Nexus 7 (2012/2013) and the Nexus 10. However, seems like we would have to wait a little longer to get the chocolaty Android 4.4 officially. Luckily for us, we don't need to wait for the official Android 4.4 update; here is how to manually update Nexus7 to Android 4.4 Kit Kat.

Prerequisites to check before you manually update Nexus 7 to Android 4.4 Kit Kat:

Nexus 7 (2012 or 2013) or Nexus 10 should have drivers installed.You should have access to a Windows PC/Linux/Mac and a microUSB cord.Your Nexus device should be running on the latest variant of stock Android 4.3: build number JSS15R for the Nexus 7 (2012), JWR66Yfor the Nexus 7 (2013) and Nexus 10.You also must have latest version of the Android SDK.Ensure your Nexus device is also fully charged.Optional but recommended: create a backup of your data before you begin.

Note: this methodwill notaffect any data, and you shouldn’t lose any of your app data or settings. But be on guard! Also, this method is only for WiFi variants of the Nexus devices. Do not try it on other Android devices.

How to manually update Nexus 7 to Android 4.4 Kit Kat:

Required files: Download the latest Android 4.4 KitKat fromhereor the Nexus 7 (2012);for Nexus 7 (2013) click hereand forNexus 10 clickhere.

Go to Settings> About Phone> Click on build number seven times until you get the message You are now a developer. Go back to Settingsand scroll down to find the Developer Optionssettings. Tap and enable USB debugging.Now connect your tablet to your PC and a warning should pop up will appear. Click Always connect to computerand accept. Disconnect the USB cable from the computer and turn off your device.On your computer unzip the Android SDK - already installed.Rename the downloaded Android 4.4 update and rename it to something easy say, Android KitKat. Move the renamed file to the Android SDK in the folder titled Platform tools.Power your Nexus back by holding Power and Volume Down buttons simultaneously. You will now be in the fastboot mode.Scroll up using the volume up button and use the Powerbutton to selectRecovery mode. It will show you Google logo and you’ll be greeted by an Android bot and no command writtenmessage. Connect to your PC using the USB.Now hold the power button and then quickly hold theVolume Upbutton while still holding the power key.Go down toapply update from ADBand use the power button to accept.Back to PC - open the folder containing the Android SDK and open the platform tools. On Windows Vista/7/8, hold shift and then right click on any empty space. Click Open command window here;if you’re using Linux/OSX/Windows XP, open a command prompt and then navigate to platform-tools.In the command window type:adb sideload Android KitKat.zip

Your Nexus 7 (2012, 2013) or Nexus 10 will now install the update itself.When you see the counter hit 100% and you can boot up your device.

Root is lost now using this update. But, your Nexus device has got the new KitKaty flavor!