Re-flash D-duino-32 SD

Dear,
I have tried to re-flash the board D-duino-32 SD but always when I run “esptool.py” it go out with a fatal error
For example if I execute:

The tool do:

[code]esptool.py v2.5.1
Found 1 serial ports
Serial port /dev/ttyUSB0
Connecting…………………_____
/dev/ttyUSB0 failed to connect: Failed to connect to Espressif device: Timed out waiting for packet header

A fatal error occurred: All of the 1 available serial ports could not connect to a Espressif device.
[/code]
The board do RESET but never enter in DOWNLOAD mode, always in BOOT mode
From PuTTY:

rst:0x1 (POWERON_RESET),boot:0x3f (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0x00
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff0008,len:8
load:0x3fff0010,len:2232
load:0x40078000,len:11744
load:0x40080000,len:252
entry 0x40080034
E (251) sdmmc_req: handle_idle_state_events unhandled: 00000004 00000000
E (252) sdmmc_cmd: sdmmc_card_init: send_op_cond (1) returned 0x107
Card Mount Failed

Where is the problem?
Is the schematic available?

Thank you
Dino

The problem is the poor quality of the board… there is no capacitors on power, the creator hasn’t followed the guidelines from the ESP32-WROVER datasheet regarding placement of capacitors for the power supply… I have added a capacitor of 100nF and one of 22uF on the pins GND and 3v3 and now I can re-flash the ESP32!
Some time it not start to flash but if retry it go…

Thanks for your information I noticed this problem and I will improve this problem asap!