Install ESP8266 File Uploader in Arduino IDE for SPIFFS - donskytech.com
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Esp8266: Read and Write from/to EEPROM (Flash Memory)
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Amazon.com: Dorhea ESP8266 ESP-12 ESP-12F NodeMcu D1 Module WeMos Lua 4M Bytes WLAN WiFi Internet Development Board Base on ESP8266 ESP-12F, Compatible with WeMos Mini (Pack of 5) : Electronics
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Esp8266: Read and Write from/to EEPROM (Flash Memory)
ESP8266 Memory Upgrade, 512K to 4MB for less than a dollar. - YouTube