how to reset or reboot the system with out pressing the on and the +volume
the system of ule fone are not running, it only display the ule fone s10 powered by android then if off and it back the display again is ule fone. it repeatedly it doesnt run the system. i try to reboot by pressing off and +volume and selecting fast reboot but it doesnt run. i try to remove the battery but it is fix. how to solve this case, thanks