In this short tutorial, I will explain how to change Sonoff WiFi Smart Switch firmware with Tasmota, using MacOS Catalina. No worries, it’s very easy. Let’s move on. — Before starting this tutorial, let’s go through short reminders. What is Sonoff WiFi Smart Switch? Sonoff is an ESP8266 based device providing users with smart home control. It’s a WiFi switch that connects to a variety of devices.