I have succesfully updated my n54l from 6.0.2 to 6.1.3 update 1 with ejt01´s guide. I can confirm that this works fine.
The only issue I´m having right now is that unfortunately WOL has stoppped working since I updated. I got the same MAC as before and inbefore it worked flawlessly. If someone has a suggestion as how I could get it to work again, it would be much appreciated