Firmware 10.0 has a bug (swim activity): https://forums.garmin.com/forum/on-the-trail/wrist-worn/fenix-5-5s/1391181-swim-lap-count-goes-wrong-7-8-9-10-11-22
So I´ve tried to downgrade to 9.20: http://gawisp.com/perry/fenix_D2_tactix/
I just copied the file ("fenix5_920.gcd" renamed GUPDATE.GCD) into the Garmin main folder. I disconnected the watch from the computer.
Normally after disconnect the installation option should appear. But nothing happens! After connecting to the computer again there is no more "GUPDATE.GCD".
What am I doing wrong?
