I I have problem and need to reset it back to default. How can I do it with the reset button ?
If you look modem source codes you can find comment in the code:
// Hold for 5 seconds to switch to 300 baud
// Slow flash: keep holding
// Fast flash: let go
https://github.com/RolandJuno/esp8266_modem/blob/master/esp_modem/esp_modem.ino#L311
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