How to give priority to an equipment

[diabolyk]

Hi all,

I'm on a AC86U on Merlin last release, and would like to give priority to my Android TV box (wired).
How is it possible to give it priority on all other equipments connected, but only to this one ?

Thanks helping me, and sorry for my poor English (I'm french )

 

[whatsup]

see images

 

[diabolyk]

see images

Ok but i should put in all my equipments no ?
I just want that router give all the time priority to my Android TV box wirhout changing anything else.