The latest was yesterday trying to update the Charge HR - it simply stopped at 50% and froze. The device was bricked but Fitbit support told me to try updating again or removing/adding to the account again.
We tried this with no success. I then remembered how all previous updates for other devices failed on Vodafone cable. Disconnected my laptop from the LAN, connected to the Snap WiFi router and the update completed ok.
I suspect somewhere, somehow the Vodafone proxy is corrupting the update files for these devices.

