I filnally managed to solve this problem. i bought a new cable usb 3.1 Gen 2,10 Gbps, USB-C to USB-C , 100 w(20V, 5A), and the method that works so that the laptop would recognize my hero 8 black is :
a) first , connect the usb cable in usb laptop
b) turn on my hero 8
c) connect cable to hero 8
and thats work well :)
if you dont turn on your camera before connecting usb cable ,your laptop won"t recognize your camera !!!
Another method work well with original gopro cable :
a) connect to your laptop an USB Hub (i put here a photo with my model, buy from amazon)
b) connect your original gopro cable to usb hub,
c) turn on your camera
d) connect cable to hero 8.
it will work well :)
third solution is to buy new gopro cable ( blue usb color) , work well but connect cable only with camera on !!!
