Use a USB-C flash drive to update the firmware on the 4-Slot Battery Charger.
Prepare the USB-C flash drive.
Copy the required firmware files onto the USB-C flash drive.
Unplug the DC power cord from the back of the charger, wait 5 seconds, and plug the cord back in.
Remove the rubber plug from the USB-C port on the charger and insert the USB-C flash drive.
Wait for the automatic update process to complete. Typically, it takes 10 seconds.
One LED alternates between green and red to indicate the firmware update is in progress. If the charger reboots, all four LEDs cycle through colors and then turn off.
Remove the USB-C flash drive, replace the rubber plug, and power cycle the charger one final time.
