The problem with the installation of the AAT for ZTE v220 phone. You can not install root mode. The phone is in the root. From file update.zip is fatal error: footer is wrong & signature verification failed. how to install it.
sorry for bad english
my android 4.4.4
Did you “root” the phone ?
yes
It looks to me you are trying to install the wrong version.
On rooted devices you will need :
https://play.google.com/store/apps/details?id=com.avast.android.antitheft_setup&hl=en
just I try to install this version 
What did you do/use to root the device ?
my device is root I used kingoroot. Another application which required root works fine
Only thing I can think of is that avast root version is not compatible with kingoroot.
But I am not a expert when it comes to mobile devices so don’t take my word for it.
I will try to attract attention from someone with more knowledge for you.
Thank you