How to Manually Update
Nexus 5 : Update to Android 4.4.1 ( KOT46E ) from Android 4.4 ( KTR16M )
To update manually need to have the Android SDK and the drivers of our Android device installed and follow these steps:
Download the appropriate file for updating us .
Save the ZIP file in the Platform -tools folder of the Android SDK .
Connect the device to your computer .
Turn off the phone and turn down both Volume Up + Volume Down + Power to enter the bootloader .
Login to the Recovery mode using the volume keys to change option and the Power button to enter.
When an icon with an exclamation press Volume Up + Power simultaneously displayed.
Select apply update from adb .
Write from the terminal window or command your computer sideload the adb command next to the name of the update.
For example :
adb sideload 7ed504f678cea49ecf0974e8cd956e2974e3f943.signed - hammerhead - KOT49E -from- KRT16M.7ed504f6.zip
After installing the update we just need to restart the device. This process will update the device respecting our data and that is what would the OTA automatically .