After almost a year of use, i realized that camera was stuck on logo of viofo and was not working. I tried to isntall the new firmware V4.0 or previous versions, i used many types of micro sd cards but always getting the same result. It is stuck on logo, sometimes makes a repeatedly beep. The only button it works in the "power" button for on/off. It seems trying install the firmware because the power button flashes green but after 10 seconds i get the logo screen. Any thoughts ? I would appreciate any help.