Hi
I wrote a tool for this that is easy to use download and install to the set directory then just click the relevant button
https://github.com/Judslat/NewGimcal
Nope just the original controller
Yes a lot of people have had issues with the go4 app and the newer iphones and ipads, mainly i guess because the app was written for a much earlier IOS version, that said i cant get the latest version to work...
what is it you are needing to do? all the updates are done via a USB stick inserted into the controller or an SD card inserted into the camera slot from memory