Make sure you select Use Device Mac instead of Use Randomized MAC in your device's WiFi network settings (if you are using WiFi connection) Privacy section to avoid getting new MAC address each time you reconnect/restart the device.
Make sure you select Use Device Mac instead of Use Randomized MAC in your device's WiFi network settings (if you are using WiFi connection) Privacy section to avoid getting new MAC address each time you reconnect/restart the device.