What to do when my Motorola Moto E gets stuck on Moto logo screen?

i have moto e 1 generation i update my moto e to 5.0.2 lolipop but after 10 days my phone appears an message on screen that com.google. something like that unfortunately stoped and phone suddenly restart and stuck moto logo image . itried to install 4.4.2 kitkat stock rom using fastboot but an error messge appears in cmd that remote failure PIY sign invalid . so please help ME  to get out from this problem...


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