Hi,The following procedure has worked for me in downgrading the RC controller firmware.
The DJI GO application can be used to easily downgrade the Spark remote controller firmware. Follow these steps to downgrade the firmware: 1) Charge the remote controller until it’s at least 50% charged. 2) Connect an OTG cable 1 between the micro USB port on the bottom of the remote controller and the port on your mobile device (or connect the two via Wi-Fi). Note: Your Spark should be powered off (so it doesn’t connect to the remote controller).
3) Start DJI GO. If DJI GO displays the camera view, click the “DJI” logo at the top, left of the screen to return to the DJI GO welcome screen. 4) Tap and hold the menu button at the top, right of DJI GO welcome screen for at least 5 seconds. When you release your finger, you should see the dark gray “Select firmware version” screen appear.
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5) Select the firmware version you’d like to install from the list and tap “Firmware Refresh” to install the firmware.
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