Detecting chip from UART, but unable to flash / dump the code to detected chip.

[Vinayak]

Hi ESP Community,
I am trying to flash code to ESP32-D0WD-V3 (revision 3) which is on custom board. I am able to get the Chip ID and MAC address of the device. But, code is not flashing. I am getting the following error message.

esptool.py v3.1-dev
Serial port COM3
Connecting........__
Chip is ESP32-D0WD-V3 (revision 3)
Features: WiFi, BT, Dual Core, 240MHz, VRef calibration in efuse, Coding Scheme None
Crystal is 40MHz
MAC: c4:dd:57:93:7f:64
Uploading stub...

A fatal error occurred: Invalid head of packet (0x65)
CMake Error at run_serial_tool.cmake:50 (message):
python C:/espidf/esp-idf/components/esptool_py/esptool/esptool.py --chip
esp32 failed.

[msgluk]

I had one module that could not be flashed. It turned out that the memory chip was upside down and not soldered.