How to downgrade Nexus 5 and Nexus 7 from Android L to KitKat: Step-by-step guide

Last month Google previewed Android L at I/O, and immediately after, it released the operating system preview to the developers. You however don’t have to be a developer to try out Android L now, and all you need is a Nexus 5 smartphone or a Nexus 7 tablet. 

But after upgrading your nexus device to the Android L and finding the OS is unstable then if you feel that it all over you are in trouble  wait there, take a breathe  here  full guide how to downgrade to back update!!! Now smile ;)

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Android KitKat image

The first step to returning your Nexus device to its original avatar is to first download the relevant Android KitKat image. These images are available on Google’s Developers website. The Android KitKat image too will be downloaded in a .tgz format, but before you extract it, ensure you have deleted all the files that were extracted from the Android L image. Then use WinRAR or 7-zip to extract the files to the same folder that contains the Android ADB and Fastboot tools.

Fastboot mode

The next steps are the same as the ones you followed to install Android L on your device. First off is putting the device in fastboot mode. Power it off, while still connected to the computer and either press the volume up, volume down and power buttons simultaneously, or in the command prompt, type ‘adb reboot-bootloader’ — without the quotation marks.

Unlock Bootloader

You will then need to unlock bootloader to install the Android KitKat image. In the command prompt type the command ‘fastbook oem unlock’ (without quotations) and in the confirmation page use the volume rocker to move the option to ‘Yes’ and press the power button to select the option.

Installing Android KitKat

Now that the device is prepped, in the command prompt simply type the flash-all command. This will start the process of installing Android KitKat onto your Nexus smartphone or tablet.

source:BGR