A. 1. Update the HX hoverboard app to the latest version available in the App Store, as updates often include bug fixes. 2. Check for iOS updates by going to Settings > General > Software Update and install any available updates, as compatibility issues can cause crashes.

B. 1. If the app continues to crash, try uninstalling and reinstalling it. Press and hold the app icon until it wiggles, tap the 'X' to delete it, then reinstall from the App Store. 2. Free up memory by closing other apps running in the background.