Well...
...after all these days without any success, today i must awake with a lamp over my head
Question: If our/mine problem regarding COM/USB port is the quickness that it changes to USB how can we slow it down?!
Answer: Plug an USB extension (big) between phone and PC and...voilá ;)
Simple, isn't it? (maybe this could be refereed on OP)
Now i got another problem
Probably i made some mistake between 7 & 8 passe and i ended with a complete black screen that doesn't respond to power button, no red light even if i unplug battery cable inside K910.
Any sugestion?!
Thanks ;)