Please re-power on and test it with the latest version of the parameter configuration software.more
The problem caused by the short circuit of P0.3 (TXD) and PROG pin; please contact the technical staff for detailed solutions.more
Check if the jumper cap is connected correctly.more
Please determine how many volts is the power supply? Are the antennas matched?
If there is no problem with the above, please contact customer service
No, we don't provide specific chip models for the time being.more