Rooted ! i learnt some new stuff about t***** 
some hints without spoiling much…
foothold: its just in front of you, take a deep breath, look for all the details and once you are on the right track just google where to search for that piece of info in case you dont know where 
user: something bad happend lets crack it !
root: really straightforward as hinted before is one of the very first things you do if not the first
“Worst” part for me was the foothold (in terms of time spent on it) but just because i wanted to hurry it instead of taking it slow.
Really nice box, thanks @egre55
If any1 needs some nudge feel free to ask