Therefore, searching for "1 13" is an attempt by users to find a calculator tool that specifically supports that firmware version, hoping that a standard serial-number generator will work for their specific unit.
On the identification sticker located on the top or side of the metal casing of the RCD 300, you will find various numbers, including the Serial Number (S/N), the Part Number, and often a software version. Many users find "V 1.13" or a similar variation printed there.