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jacek_o-
found the topic - check http://forum.espruino.com/conversations/370717/#16299790 or here http://forum.espruino.com/conversations/374715/#16475478
regarding the hole - there is some stuff in it to protect from dust/water but keep pressure sensor working, also I can't find some photos of internals now but let's hope you won't break something inside near the hole you make
fanoush
Yes, that is most probably the problem. They later added small hole on the top side where the strap is. If you have no hole there the watch is a bit more waterproof but you get pressure inside watch not outside. Also search the forum here, there are more details, some early Bangle 2 watches are like that too. I also have such Q3 without hole and can confirm it behaves like that.