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

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By martinayotte
#49149 From what I see on the Huzzah schematic is there is no PullUp on GPIO0 and they seems to rely on the fact they placed an LED on it along with the boot switch.
https://learn.adafruit.com/adafruit-huz ... /downloads
To my opinion, this is badly designed, since the LED won't act as a PullUp until it start conducting, and even then, the drop voltage across this LED will prevent having a "good" HIGH level on GPIO0.
Therefore, you should try to add yourself a PullUp resistor in parallel to the whole LED circuit and provide us your experiments results again.

EDIT : what is also strange, is that bad behaviour about improper boot mode, should always occur, not only in OTA context.