This is an expansion board for the ESP-01S WiFi module. After power-on, the module is in BOOT flash mode. The AT command can be directly tested through the serial port on the shield.
To burn the firmware, first press and hold the Flash button on the shield, then click on burning on the software interface, and press the RST button.
When release the Flash button, the module will enter the download mode and start burning the firmware.
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