I had a job yesterday where I just happened to throw the Iris + in the car last minute. I've been using the Phantom Pro 3 and have a few mapping apps that puts it in almost autonomous flights, I just nudge the landings.
Nothing was working, I was deleting apps & re-loading them to see if that was the problem. Finally one of the apps said I needed new firmware on the Phantom. I thought, "screw it" & that I'd fly it manually in 4K and get the pictures that way. Last time I did that, the drone lost connection & stopped filming for some reason. I was desperate though. Go to the DJI app to fly it & it said I needed new firmware. I had calibrated it through this app the hour before (that's how long it took me to troubleshoot). It wouldn't even take off in manual.
I just did it with the Iris+ & the GoPro & it flew just fine. So frustrating!! Really, this should be a press of a button. I spent the night before calibrating, charging, checking for updates & getting everything ready. I'm glad I brought my duct taped Iris+ w/ me or I would have had nothing.