ESP32 Forum

Can not flash my new project on ESP32-D0WDQ6 (revision 0).
Assume that one of specific gpio was used. Peale suggest which one. Schematic attached to the ticket. GPIO5 and MTMS pin are removed already, but result is the same. Can some one give any advice?

Are you getting any serial activity on U0TXD at all? If so, can you post what it says after trying to reset into download mode?

Here is my flash log:

esptool.py v4.2.1
Serial port /dev/ttyUSB0
Connecting....
Chip is ESP32-D0WDQ6 (revision 0)
Features: WiFi, BT, Dual Core, Coding Scheme None
Crystal is 40MHz
MAC: 24:0a:c4:80:27:0c
Uploading stub...
Running stub...
Stub running...
Changing baud rate to 460800
Changed.
WARNING: Failed to communicate with the flash chip, read/write operations will fail. Try checking the chip connections or removing any other hardware connected to IOs.
Configuring flash size...
Flash will be erased from 0x00001000 to 0x00005fff...
Flash will be erased from 0x00008000 to 0x00008fff...
Flash will be erased from 0x0000e000 to 0x0000ffff...
Flash will be erased from 0x00010000 to 0x00126fff...
Warning: some reserved header fields have non-zero values. This image may be from a newer esptool.py?
Compressed 17536 bytes to 12203...

A fatal error occurred: Packet content transfer stopped (received 8 bytes)

I am not sure if I am answering your question, but I managed to get a WROOM 32 into boot mode as follows:

(correction): Install 10K resistor parallel to C20.

Increase C20 to 10 uF or larger.

Hope this helps. Please let me know.

I am not sure if I am answering your question, but I managed to get a WROOM 32 into boot mode as follows:

Connect R21 to GND (and not 3V3).

Increase C20 to 10 uF or larger.

Hope this helps. Please let me know.

Unfortunatelly it does not work for me

WARNING: Failed to communicate with the flash chip, read/write operations will fail. Try checking the chip connections or removing any

Ahrg, I could have spotted that in the schematics. You can't program the flash because there is no flash to program: The ESP32-D0WD does not come with in-package flash; you need to supply that yourself, and I don't see any in your schematic.

WARNING: Failed to communicate with the flash chip, read/write operations will fail. Try checking the chip connections or removing any

Ahrg, I could have spotted that in the schematics. You can't program the flash because there is no flash to program: The ESP32-D0WD does not come with in-package flash; you need to supply that yourself, and I don't see any in your schematic.

Ah.. shame to me. Can you suggest any pin-to-pin with programable flash?

Unfortunatelly it does not work for me

My error. Please see my corrected post.

But it will not work without a flash.

Ah.. shame to me. Can you suggest any pin-to-pin with programable flash?

Sure. The datasheet also has the type numbers for the chips that do integrate flash; for instance in your case you want the the ESP32-U4WDH.