Upgrading an older Control4 system

A hand is about to touch a wall-mounted touchscreen control panel displaying options for lighting, comfort, security, and settings—showcasing home automation installation in Surrey with a smart home interface.

Can an older Control4 system be upgraded to OS 3 or X4? Which controllers, touchscreens and keypads are still supported, and what an upgrade involves.

What is Control4 and how does it work?

Control4 touchscreen showing music playback for the games room

Control4 runs your lighting, heating, AV, blinds and security from one app, remote and keypads. What it is, who makes it and how it works in plain English.