Q: What should I do if the device cannot perform any operation after a firmware upgrade fails?
A: Device symptom: After powering on, only one or two lights on the device are flashing.
Reason: The connection is broken, the device cannot find the firmware address, and the upgrade was terminated at the current progress.
Solution: Reopen the configuration software, reopen the port (note: do not read the configuration and device, just open the port and select firmware upgrade), and click on upgrade again.