Connect the RJ45 end to the inverter's COM port and the USB end to your laptop.
Before downloading random .hex files from the internet, you need to understand why you are doing this. Easun does not push automatic over-the-air updates. You must manually intervene. Common reasons include: easun firmware update
Then, the click.
Once the tool shows "Update Successful," the inverter will usually reboot. Go back into the LCD menu and check the settings to confirm that the version numbers have changed to the new version. Troubleshooting Common Issues Connect the RJ45 end to the inverter's COM