I recently plugged in my custom PCB ESP32 datasheet and couldn't even get firmware to upload to it! So I am pretty dead in the water with this board right now. The funny thing is I have successfully used this firmware upload circuit in the past, even with the same layout. But recently I decided t…

Problem turned out to be a DOA esp32 chip. I soldered a new one on there and bam everything started working.

Cannot upload firmware to microcontroller

JohnRob November 5, 2021, 4:31pm 4

Sorry I missed the flag

I found this for the 8266, I don't know if there are similar requirements for your device.

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