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I need the OTA firmware update. I have the only option in my hand GSM(GPRS SIM800), with the help of this is it possible OTA, plz help me for this how I Do OTA via GPRS, FYI, I completed OTA Via WIFI.

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Download the bin file over GPRS and then use the Update singleton object. It is declared in Update.h. Example is ArduinoOTAClass::_runUpdate() in ArduinoOTA.cpp or ESP8266HTTPUpdate::runUpdate() in ESP8266httpUpdate.cpp

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