I have found the solution my TX pin was share with uC TX which forced it to high level

After adding a capacitor of 100nF to GPIO9 I have been able to receive following start up message, but I am still not able to flash [Codebox=c file=Untitled.c]ESP-ROM:esp32c3-api1-2021þESP-ROÍESþESP-ROM:esp32c3-api1-20210207<CR><LF> Build:Feb 7 2021<CR><LF> rst:0x1 (POWERON),boot:0x4 (DOWNLOAD(USB/U...

Thanks for your help,

I have found that adding a 100nF capacitor to GPIO9 boot pin fixed the error

Hi, I am struggling to flash for first time my custom board with ESP32-C3-WROOM-02-H4. You can see attached my schema, where R1 has been added by rework after first failed try. When I connect board to my pc through a USB/UART adapter (FTDI232) I receive following answers: ESP-ROM:esp32c3-api1-202102...