: If the "CH BOOT" drive doesn't appear, try a different USB cable. Many charging cables do not support the data transfer required for firmware flashing. Hardware Variants
If your device is working well, . FNIRSI firmware updates rarely add groundbreaking new features and carry a risk of bricking the device if the hardware batch is slightly different. Only update if you are fixing a specific bug listed in the changelog. fnirsi dsotc2 firmware