Please download the firmware update tool from below link.
Step 1: Mount the adapter onto the update tool included.
Step 2: Connect the update tool with the computer using a Micro USB cable. Please make sure the cable used is capable of transmitting data. Some cable can only do charging.
Step 3: Download, unzip and install the software above.
Step 4: Select the latest firmware of your model and click Update
Step 5: The firmware will automatically be updated and loaded into the adapter. A loading icon will be shown. The whole process takes less than 5 minutes to complete. Once the process is done, unplug the cable.