Sometimes even with devkits from espressif i have to press BOOT to keep IO0 low until flashing start. You can try this. The board isn't by espressif, I've made it from scratch, and everything works, the only thing i also wanted to DIY was a programmer, and I wasn't successful at it. I've decided to...

I don't believe it's a problem with the Rx line as I can get regular UART messages without any problems it's the flashing process that fails No, I mean the other line: Tx from the CH340 to Rx of the ESP32. If that's not OK, the ESP32 won't respond to flash commands either. Your scope images look OK...

Here is some extra information captured with my oscilloscope BLUE= ESP32 TX YELLOW = ESP32 RX Here, the ESP32 is talking to me and I see the messages from the esp to my computer: IMAGE1.jpg Here is when the programmer tries to talk with the esp (the esp is already in programming mode (IO0->GND, RESE...

That looks good. In what way is flashing failing? Perhaps there is an issue between the CH340 and the ESP32 Rx line? The flashing just times out as it stays on "Connecting..........." and then fails to upload any code, I don't believe it's a problem with the Rx line as I can get regular UART messag...

Hello, I'm having a very strange issue with a ESP32 board so, heres the problem: When I try to communicate to the board via serial (i'm using the CH340G) it works, i see messages that the board sends me and i can send the board messages, but when I try to flash it refuses to work, done the usual (IO...