Changes made from version 4.70 to 5.20:
- Added support for Connect IQ 1.3.0 SDK. See the Connect IQ 1.3.0 SDK for a list of new features.
- Added support for broadcasting optical heart rate over ANT to other devices during an activity.
- Added support for phone apps to subscribe for more frequent data updates.
- Added support for Apple Media Service - users can now control any active music player, e.g. Spotify, as well as volume (requires iOS 8.0 and higher).
- Fixed an issue in which text on some Connect IQ watch faces may not display correctly.
- Several improvements to optical heart rate.
- Various bug fixes and stability improvements.
I'd managed to hold off updating to firmware v4.70 (from v4.60) for many weeks – after transferring the firmware file to my watch but dismissed the update manually – after seeing all the reports of issues, especially around garbled notifications, but the other night the watch somehow got updated to v4.70 anyway. I might as well take the leap and go to v5.20, now that it appears in Garmin Express for me several minutes ago.
Who else is game? :)