If you have a S1 and already did firmware update, can you extract downloaded firmware files from you windows/android/iOS device and share them?
I'd like to take a look at their structure/formart to see whether they are signed with a key or not.

-albertr

As far as I know, the firmware update is done through the smartphone app and I don't know if one can access or save the file.

Hi, Albert. Thank you for reaching out. Unfortunately, we cannot extract the firmware files thru the DJI Robomaster app since this unit firmware will be upgraded using the app only. Also, we don't have the available firmware files on our website to be downloaded. Hope this helps. Thank you for your kind and understanding.

Well I didn't really expect DJI to share firmwares freely, however I can bet you it can be easily extracted during flashing from the device that runs Robomaster app.

-albertr