ESP32 Forum

I am using the ESP32-WROOM S3 development board. I have extra capacitance on the power supply. I have tried 3 different USB cables (all short). I have tried 3 different computers. The serial port is correct.
When I try to program the part, it always fails in the same way.

The swquence is ;

test offset : 0 0x0
case ok
test offset :0 0x0
case ok

..........................................................

Uploading stub...
Running stub...
Exception in thread Thread-1:
Traceback (most recent call last):
file "threadying.py, line 932, in _bootstrap_inner
file "downloading_process.py, line 678, in run
file "espDownloader.py", line 601, in flash_download_test
file "espDowloader.py", line 781, in flash_download_func
file "espDowloader.py", line 697, in esp_stub_and_set_baud
file "esptool\loader.py", line 912, in run_stub
file "esptool\loader.py" line 307, in read
file "esptool\loader.py", line 1428 in slip_reader
esptool.util.fatalError: Invalid head of packet (0x46); Possible serial noise or corruption.


It always fails exactly at the same point. What can I do to get the chip to program???

When you say you have "extra capacitance on the power supply" exactly what do you mean?

If you're programming over USB, the USB can provide power, and if this is a development board, then it is what it is, unless you've modified it.

I have added 2200uF directly across the 5V pins. It is powered by the (short, heavy) USB cable.

If you're using Windows, does the COM port for the ESP32 show up in the device manager?