Ensure the power cable is plugged in securely. A power cut during a firmware flash can "brick" the device (make it unbootable).
Visit the Wanbo Official Support Page or contact their support team to get the specific .bin file for your exact model number. update firmware wanbo t2 max
Scroll down to System or About and select Software Update (sometimes listed as "System Update" or "Local Update"). Ensure the power cable is plugged in securely