How to restore the default values on a keyboard in terminal? I used the hidutil function to remap several keys on my keyboard:  

hidutil property --set '{"UserKeyMapping":
    [{"HIDKeyboardModifierMappingSrc":0x70000003e,
      "HIDKeyboardModifierMappingDst":0x70000004c},
     {"HIDKeyboardModifierMappingSrc":0x70000004c,
      "HIDKeyboardModifierMappingDst":0x70000003e} ,   
     {"HIDKeyboardModifierMappingSrc":0x70000003f,
      "HIDKeyboardModifierMappingDst":0x70000002a},
     {"HIDKeyboardModifierMappingSrc":0x70000002a,
      "HIDKeyboardModifierMappingDst":0x70000003f}]
}'


My problem is that I made some mistakes in it, and I don't find the way to restore it.
Passing empty string didn't work for me, i.e. it didn't deactivate existing remappings. However, passing an empty array did the trick.

hidutil property --set '{"UserKeyMapping":[]}'