Starting from the following serial numbers NANO-B and NANO-C controllers are equipped with new hardware: NANO-B: 20040301070000 NANO-C: 20040301070300 For the new hardware OS version V3.50 or higher is required. The appurtenant OS files can be found in the directory "NANO-BCD". OS files for the old hardware can be found in the directory "NANO-BCx".