How are you supposed to update when your WiFi is occupied by the drone. When I want to update something it obviously it requires internet connection and for you to be connected to the aircraft. I know how to update something in general so no videos about that please..

I updated it while being on 4G. They question you of you want to do it later, or straight away. If you choose later, disconnect with the drone and download again. It will be saved on your device from what I've seen.

YOu can also update it from your PC! With DJI Assistant 2 V1.1.2

Hi,  I always connect with OTG or update thru DJI Assistant 2.

I think the users above answered your problem well. If you use IPhone, you can open mobile data to update it. And I would recommend you download the DJI Assistant 2 in the spark's website. Thanks for your support.