Fenix 8 is dead after automatic update

Today my Fenix 8 51mm AMOLED was dead after its automatic update (guessing updating to the latest one). Black screen. Holded down power/back for 10 seconds, saw triangle and welcome and then loading maps until map 26 then black screen again. Noticed the green light on the back is still on and off sometimes but I have no idea if the watch is on or off. Tried to do factory reset by holding down "start", "back" and "power" at the same time and "start"/"back" first and then "power" but didn't hear any beep and didn't see anything on the screen. 

Instruction from somewhere: 

This worked but the instructions are wrong.

  1. Hold down Light until watch completely powered off

  2. Hold down Light, Start and Back until here a beep

  3. Release start, still holding down Light and Back until 2nd beep

Laptop can't link to the watch of course. 

Anyone knows how to factory reset? Thanks.