Finaly I find a solution.
My problem was probably an invalid application.
I have reinstalled hello_word program with a right bootloader, following pages :

https://docs.espressif.com/projects/esp-idf/en/latest/esp32s3/get-started/windows-setup.html

https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-guides/tools/idf-py.html

I type following commands :

idf.py set-target esp32s3 
idf.py build
cd build
esptool.py -c esp32s3 -p COM3 --before=default_reset --after=hard_reset write_flash --flash_mode dio --flash_freq 80m --flash_size 2MB 0x0 bootloader\bootloader.bin 0x10000 hello_world.bin 0x8000 partition_table\partition-table.bin

I have the same issue
It appears after trying to install the application https://github.com/Xinyuan-LilyGO/LilyGo-EPD-4-7-OWM-Weather-Display

During the 10 seconds when the COM port is up, I receive from the terminal :

ESP-ROM:esp32s3-20210327
Build:Mar 27 2021
rst:0x15 (USB_UART_CHIP_RESET),boot:0xc (SPI_FAST_FLASH_BOOT)
Saved PC:0x4208db6e
SPIWP:0xee
mode:DIO, clock div:1
load:0x3fce3808,len:0x44c
load:0x403c9700,len:0xbe4
load:0x403cc700,len:0x2a38
entry 0x403c98d4

Using command line tool esptool.py :

c:\tmp>esptool.py --baud 115200 --port COM3 read_mac
esptool.py v4.3
Serial port COM3
Connecting...
Detecting chip type... ESP32-S3
Chip is ESP32-S3 (revision v0.1)
Features: WiFi, BLE
Crystal is 40MHz
MAC: 68:b6:b3:20:8c:0c
Uploading stub...
Running stub...
Stub running...
MAC: 68:b6:b3:20:8c:0c
Hard resetting via RTS pin...

If you have a soluce, thanks to help us