Check that the drones camera is plugged into the mainboard. If thats not it, manually update the firmware. Even if it you're overwriting same firmware version.
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=== Update (03/29/2017) ===
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forget the WiFi ssid from your phone settings and open the apk first and connect via the app only
Check that the drones camera is plugged into the mainboard. If thats not it, manually update the firmware. Even if it you're overwriting same firmware version.