Only 2 listed... use the Pro FW since you don't have the X5R.
Haven't used my Inspire 1's for a while, if I recall, the common practice was placing new FW on microSD card... that procedure updated everything. I also thought I1 Batteries (additional) were prompted to update on GoApp after craft was updated.
I'd suggest downloading DJI Asst, have payload attached, plug into I1 to DJI Asst. It will connect and provide update options. It was not originally supported by DJI Asst 2, although I believe it is now... below link and Post #2.