How Can I Stop an Android Installation in Progress?

[AC Question]

A couple of months ago I was forced by the service provider to download the latest version of Android Lollipop. Since then I get constantly a notification to update my phone, which I have always canceled. Today popped up this notification and I accidentally pressed the "I Agree" button. Then a message appeared which said "The device will now restart and the installation will continue". The phone was restarted and a black screen with the Android Robot in the middle appeared and underneath stated "System update in progress" plus the percentage of the progress. I immediately removed the battery as I had no other choice to shut the phone down. Every time I put the battery in and turn it on the same screen appears.

How can I cancel the installation? I really do not want to update to Android 5 Lollipop

Phone Specification:

Samsung Galaxy Alpha - 4.4.4 KitKat

 

[spagman]

I believe once the installation is in progress there is no way of stopping it.

I do know there are ways of preventing the phone to accept updates... But this has to be done before the phone searches and finds the updates on the carrier servers.