Hi, thanks for using JustAnswer.com I am Cris and will be glad to assist you with your question.
Firmware updates for these models happen automatically, but you have the option to manually check for updates by following the steps below. It's best to update the firmware when you're at home, just in case something goes wrong and you need to reset your Slingbox.
Let me know if you have any further questions. Please take the time to rate my service at the top and submit.