You can update it via the menu options, software update, but you don't need to re-flash an image, unless there are major improvements, a bit like moving up from Windows 10 to 11, only the updated images are free, provided by fellow enthusiasts, but your receiver will continue to work with even older images.
In the menu options you will find audio options, the default should be set to English, but you can have 1 as English, 2 as Undetermined, and 3 as Original, or other language options, there are also display options, and plugins, like Kodi, that can be added.
If you only have a motorized dish you don't need to use the advanced setup option, just go into menu, Setup, Tuners & scanning, Tuner Setup, select the Tuner, Configuration Mode Simple, Mode to Positioner, and enter your Longitude, and Latitude, remember negative Longitude readings = West, positive = East, so -3.xxx = 3.xxx West.