The DJI Spark has received a firmware update that enhances flight safety and performance. You will have to update it by September or your won’t be able to take off with the drone. In other words, this is a mandatory firmware update. Here is what the company had to say about the new firmware:
When prompted on the DJI GO 4 App, users with internet connectivity will be able to download the new firmware to update their aircraft’s and battery’s firmware. The aircraft and battery firmware updates can also be done via the DJI Assistant 2 desktop software. If the firmware of either the aircraft or the battery is not updated by September 1, Spark will not be able to take off. DJI decided on the option of a mandatory firmware update in order to maximize flight safety and product reliability which we consider as top priorities.
The update brings video/photo improvements and other fixes. More info is available here.