Garmin GLO firmware update for iOS 10 and later

As of January 2017 the latest Garmin GLO firmware version is 2.9.0; if you have an earlier version, you should update to use the GLO with iOS 10.

Garmin publishes a GLO firmware updater at: 
http://www8.garmin.com/products/webupdater/howtoinstall.jsp

This installs the firmware updater on a PC. The Garmin WebUpdater program, when it is run after PC installation, recognizes the GLO when it is connected via USB and does the firmware update.