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The Kit Kat firmware we’ve got here is build 21.128-15, the latest update for Droid Turbo before the Android 5.1 OTA.
Though, there are pre-rooted 5.1 system images available that support Mofo root, and you can install this over your Mofo rooted Kit Kat running Droid Turbo to upgrade to 5.1 with root access retained.With Android 5.1 update out for Motorola Droid Turbo, you need a way to install the stock recovery and stock system image back on your phone, so that you can go ahead and install the Android 5.1 OTA on your Droid Turbo.Well, we have out together a guide here just for that, with a direct and speedy download link to Kit Kat firmware.This guide lets you install Android 4.4.4 Kit Kat firmware on Moto E XT 1022 (India). Download mfastboot files [HERE] and save it to the directory where you have saved the firmware files. Now you have successfully flashed the stock 4.4.4 Kit Kat ROM on your Moto E.Note: Before you start downgrading your Moto E 1st Generation to Android 4.4.4 Kit Kat, please note that your device should not be rooted and custom recovery installed.
Note: This would not help you downgrade back to Android 4.4.