I have an Venz V3 box - and the reset button (very flimsy) has broken off.

Does anyone know how i flash it again with a new ROM without using the Toothpick method - another way to reset it

Got a black screen and want to re-install a new operating system on it

Got a usb flash package and an Type A to A usb lead - but cant detect the box - which has power !!!!!!!