I had to open my Vivoactive HR because it wad died, what I saw it was water inside device :(
Now I know that it is no super easy way to open this Garmin.
1st. you have to unglued plastic part where buttons sits
2nd. using this hole (buttons whole) you should gently push screen using something like screw
* be careful with electric tapes (there are few) it is easy to broken (tear) using only a little force
* there is only 1 screw on button board
Maybe my photos will help anybody to repair this Garmin.
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