Multimeter function is not working

Hello. I have a ZT-703S with a problem: the oscilloscope function works fine, all buttons work, and it takes measurements normally. However, when I switch to the multimeter function, only a few windows appear, including the analog scale, but no numbers appear. It no longer responds to functions like diode, resistance, and voltage. I updated the firmware and reset the settings to factory settings, but it still hasn't returned to normal. Does anyone know how to fix this?