Yes, to update firmware, you use the micro sd card but you copy the download firmware to the card with the receiver in USB mode, not in clone mode.
if you have programmed anything into the receiver, it might get wiped out. Make sure you have the North American version of firmware and use 1.11. Version
ADDED/CORRECTION - Now that I am home on a real PC (and not a cellphone), the firmware versus is called USA Version. There is only one version of the CS-R30 software for the whole world. Bottom line, the firmware on the receiver has to be at the same basic level as the software on the PC because the memory organization and some menu options changed with firmware upgrade to V1.1 but V1.11 just fixed a few small problems.