Note: This board is very picky about chips. Buying domestically produced chips is very likely to cause problems. I soldered four of them and only two of them worked properly. These two were blown off two of the smallest systems. It is a common symptom that they cannot be used. The light is always on, but Keil cannot recognize it, but the serial port can be used. The reason has not been found yet. The firmware is the firmware of Jixin, and the light under the board will flash when it works normally, so I concluded that there is no problem with the circuit, and it should be the chip selection.
Post some actual pictures.
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