That won’t upgrade so much as it will overwrite, to anybody reading this thread and misundestanding. A flash of an SD card will overwrite all data on the card.
As to alternative methods of updating. I would give nearly anything if Nvidia would just use apt or something simple, but they’re in love with their SDK manager and flashing sd cards. Raspberry Pi has had this solved for years.
Google’s Coral has no sdk manager. Their downloads you an all get directly from a link and there are no mandatory checkboxes or logins. That being said, Google will probably cancel Coral while DeepStream is at version 4.