Before trying to update the app on an older device, see "What version of ForeFlight can be installed based on the version of iOS on my device?" for details on which version of ForeFlight Mobile works with your version of iOS.
To update the ForeFlight Mobile app on your older device, follow these steps:
STEP 1. Open the App Store app.
STEP 2. Tap the Updates button.
STEP 3. Tap the Updates button ten times in a row. The screen will go blank for a couple of seconds as the App Store reloads. The ForeFlight Mobile app will be shown if an app update to ForeFlight Mobile is available.
Note: You can also delete and then reinstall the ForeFlight Mobile app to ensure the latest compatible version is installed. See "How do I install ForeFlight Mobile on my old device?" for instructions on installing ForeFlight Mobile on an old device.