Use this forum to chat about hardware specific topics for the ESP8266 (peripherals, memory, clocks, JTAG, programming)

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By martinayotte
#26613 ESP-07 and ESP-12 are almost identical, except about the antenna.
Maybe you can try again uploading your ESP-12, but before doing so, maybe it is good to upload a blank512K.bin to make sure everything is erased first.