Originally Posted by bajlek
It doesnt react on any button or any combination
So that means, that the preloader is bricked. Because if it would react on any button (Volume Up, Volume Down, Power), then it would normally react. For those buttons are being handled by the preloader partition file. If you either flashed the preloader from a wrong ROM (Like I did one time on Wiko Lenny 3), then no button will react. Those buttons are being handled by their ID's (I think, not sure). Preloader handles the Button ID if it is pressed. If yes, preloader will detect the clicked button and handle the action (for example: Clicking the power button when Display is off → Makes the Display to go on).
If the preloader is bricked, then either you need a new phone or reflash the preloader.