updates

I recently did the required updates on my Spark, and now my controller is totally useless. It is no longer putting out a WiFi signal. All was fine until the updates. Is there any way to return the controller back to factory settings? DJI says I have to return the controller to them.

We're using Spark as an indoor tactical tool for a SWAT team. But, I'm concerned that after starting DJI GO and Spark that an entire operation can go south because there's a dang firmware update that needs to install. Is there a way to prevent those updates? Perhaps keep iOS device in...