I faced issue of unable to reboot vivo 1850 when touchpad did not work. So I checked in you-tube and tried the below steps and it worked well for me. 1.Press the volume + and – button together 2. then press reboot button. 3.Mobile will open a window, which gives the option for reboot .ContinueContinue reading “[MobilePhone][Vivo 1850] – how to reboot it when touch is not working”