How to change the wifi on your EMF badge

So you’re back home from EMF and you want to get your badge on the home Wi-Fi. Typing out your WiFi credentials using the badge interface is tricky. You might be able to manage for one badge, but with multiple badges you’re going to want a better way to do this. There is documentation for how to change the wifi settings using a computer, but for some reason following these never saved the new credentials on my badge. Here is what worked for me (on firmware v2.1.1).