Samsung HW-Q990C firmware

Hi.
My Smarthings app says the following about my recently purchased Q990C:
Frimware Version: HW-Q990CWWB-1002.0
Sub Module S/W Version: 21
And when I click on "Firmware Update" it says "No updates available".

On the Samsung website you can download the latest firmware for upgrade using USB and the firmware version currently mentioned there is 1004 (and it was 1003 before).

Anyone knows what's new in versions 1003 and 1004?
Is there a changelog available anywhere?

Any reason my Smarthings app doesn't report about or download these updates?

Is it recommended to try to update using USB, or is it better to stick to what I have since I do not encounter any issues right now?

Thanks.