Most devices have a function that lets manufacturers send software upgrades to their products in order to add new features to your box or fix bugs in the software.
The latest TVs and boxes will alert you with a pop-up message on your TV screen when there's a software update. All you need to do is follow the instructions on your TV – or it may even automatically update your digital box.
The instructions will vary according to your device, so check your user manual or contact your device's manufacturer if you have any questions.
Just as you can download software updates over the internet to upgrade your PC and fix bugs, you should do the same with a smartphone or tablet.
Most mobile devices will alert you when an update is available and all you need to do is follow the instructions to download. It's important to update your device every time you're prompted to, so you can enjoy Freeview with the latest features and no bugs.