Every time then the device connect to WiFi router it write 2 sectors into eeprom 2 times.
Every day the device do it 1440 times (every 1 minute).
After few month EEPROM became broken.
There is a problem in wifi_param_save_protect_with_check() and system_param_save_with_protect().
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Espressif Systems is a fabless semiconductor company providing cutting-edge low power WiFi SoCs and wireless solutions for wireless communications and Internet of Things applications. We are the manufacturer of ESP8266EX.