I had an issue when I updated my firmware but I was able to resolve it. The problem was that during the update the firmware froze, somewhere in the forty percentile range and finally I got a firmware update failed message.
I knew I still needed to update the firmware but after that the DJI app wasn't showing me the firmware update. I tried restarting the app, sprung my iPad but nothing was working. After finally figuring out I couldn't unzip the bin on the SD card and install it that way (only for pro and advanced), I figured it out.
What I had to do was to uninstall the DJI Go app and then reinstall it. Now my software saw the firmware updates again and I started the update process over again. I had to do the update process three times before I had a successful firmware update.