I am attaching the XF250 firmware upgrade file. Please copy the file as is (don't change the name) to the root directory of a micro SD card (not included). Then do the following:
1. Insert the micro SD card into the micro SD card slot on the bottom part of the controller
2. Disconnect the controller from power.
3. Press and hold the center dial and then connect the controller to power.
4. Continue to hold the dial until you are prompted to Upgrade the controller. Release the dial when you see the prompt.
5. Press and release the center dial once to select "Upgrade". The controller will update and reboot and you should be all set.
Notable changes on this firmware:
- Bug fixes
- Screen turns off after 30 seconds of inactivity. Press any button to wake up the controller.
- Larger screen font
Let me know how it goes!