Moto E XT1022 Downgrade to Kitkat Issue

I've Moto E with Lollipop 5.1 updated. This Version of OS gives me troubles like Disables Networks, Doesnot go in Wifi Settings etc., since a week ago. Before that, its working good only. Warranty for this mobile also expired. So that, i have tried to install my Older 4.4.4 kitkat Version to my Moto E using this Tutorial. Downgrade from Lollipop to KitKat for Moto E I've done all those steps mentioned in the downgrade process. I've used the some resource files mentioned in that youtube page. But problem arised in the final process of Downgrade. After formatting process, it gives me error that "Invalid Signed Image" & "Preflash Validation Failed". I Could not find out any solution for this issue. Now my phone has no OS. SO Can anyone suggest me to Boot OS to my Phone? Any suggestions will be greatly helpful to me..