1. Connect the jetway pcDuino9s to PC via USB OTG
2. Power up the pcDuino9s
3. Open the UpgradeDll Tool on Windows
4. Go to All page and write down the MAC address(manually)
5. Check the tool find the device or not
6. If yes Click Write button to flash the MAC address.
7. Go to system information on Android system to check mac address.

Resources：

upgradedlltool_v1.38