No, you didn't miss anything, but that's not your problem. Your controller firmware is on a version that does not officially exist. Without doing some looking around, I assume it's a Beta or experimental version that has not been released. And your old APP was from Build 784.
Your best bet at this point is to do an SD card upgrade to Build 822. See Attachment 30 (SD Card Upgrade/Downgrade H Plus Firmware) of
Way To Fix Drones project. Skip "Phase 1" of the attachment. You don't need it, and can't do it anyway. You just need to do Phase 2 and Phase 3 for the controller firmware and the APP. And all the stuff up front, of course.