If this is a firmware or map update for a vehicle head unit, the process usually follows this pattern:
: Most systems require a USB 2.0 or 3.0 drive formatted to FAT32 . sc25289-ICARUpd1240.rar
: Unpack the .rar file directly to the "root" (the main folder) of the USB drive. Do not keep them inside a subfolder. If this is a firmware or map update
Could you tell me you are trying to update? This would help me find more specific technical requirements for you. sc25289-ICARUpd1240.rar