• Hmm, is this a 2MB board?

    From the output above I believe it is 4MB:

    Wrote 4194304 bytes (351432 compressed) at 0x00000000 in 31.5 seconds (effective 1064.8 kbit/s)...
    Hash of data verified.
    

    Try to flash a esp8266 firmware.

    Tried 1MB and 2MB. Still the same issue.

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