The app said update available so I updated the watch. After download the watch restarted but did not reconnect. I tried everything I could think of. Re-install the app, reset the watch. The app see the watch, I can pair it but I get the screen "device doesn't respond Please try again"
The worse bit is that it looks like there is no support from Withings but a forum.
Update: I find the way to contact Withings firstname.lastname@example.org . So far the communication is on but no solution yet.
Update 2: As I am in Australia, I have to deal with the store I purchase the watch from. No acknowledgement that the new firmware have an issue.