From my understanding this cannot be done. Back when you could get the ECU unlocked, i sent the 450 ECU off to get remapped for the 570. Was told it cant be done.
Now, KTM have since stopped providing unlock codes which means you cant remap your ECU.
Run the piggy back tuner, ie JD tuner or the EJK. Same thing, made by Dobek. Otherwise fork out for either the Vortex or GET ECU’s.