Your car battery maybe less than 12v during when engine off. You may set lower to 11.8v for the camera to off.
I suggest you go buy battery jumpstarter first. Just in case, which I also did.
Found a shop at ubi just open.... Heng....
Stay positive. Always look on the good side not the backside HardwareZone Forums app
Next time just locate the fuse and unplug it.