Getting Ice Cream Sandwich

[AC Question]

I just had my phone replaced due to my old one being stuck at the boot screen. I got the phone, charged it and went through the set-up. The only problem is that i now have the KitKat OS. I have tried to find someway to get the Ice Cream Sandwich OS back but i cannot find any good way to. Anyone know what to do?

 

[B. Diddy]

Welcome to Android Central! Which phone? ICS is really really old, and is probably significantly less secure. Why do you still want it?