ESP32 Forum

Hi all,
do you know how to flash the ESP8685­-WROOM­-03 without using testpad IO9?
JTAG signals are disabled and is not possible to program using ESP-PROG.

Thanks
Stevasway

You could try to use the built-in USB-serial-JTAG converter.

I have developed a clip-on device for flashing this chip, which can connect to a standard usb-serial device. It includes a push button for boot mode.
If you're interested I can sell you one for $20, let me know.

I am interested of buying one.

You can try using the UART bootloader method by connecting the ESP8685-WROOM-03 to a USB-to-UART adapter.

Hi,

My solution was to use an old ESP32 module as a USB serial programmer and an 8-pin DIP clip on the edge of the board. For IO9, you can solder a wire and connect it directly to the programmer's IO0, or momentarily touch a test probe with your hand during the programming phase in your preferred IDE.

Marco

My solution was to use an old ESP32 module as a USB serial programmer and an 8-pin DIP clip on the edge of the board.

That's actually quite similar to SOICbite if you want something that stays in place.

Cool, I didn't know it. Actually, there's so much stuff on the internet that it's practically impossible that someone hasn't had the same idea several times before. It's a shame the manufacturer of this module didn't place IO9 testpad in a location with easy access for soldering.

Marco