Flash only firmware on ESP32S3 via USB2 port

[mforbiz]

Hi.
Following this:
https://openthread.io/guides/border-router/espressif-esp32#build-and-run-the-border-router
it seems to me that I only must flash firmware on ESP32S3 via USB2 port and not on the ESP32-H2 chip (via USB1) port because it will be flashed at the next reboot.
Is this right?
Thanks in advance

[jwhui]

As mentioned in the guide you linked:

The firmware doesn't need to be explicitly flashed to a device. It will be included in the Border Router firmware and flashed to the ESP32-H2 chip upon first boot (or the RCP firmware changed).

[mforbiz]

Hi jwhui.
Thanks for you reply.
When I flash ESP32S3 by means:
idf.py -p flash monitor
must I specify the USB2 port (anything like /dev/ttyACM1)
so that the right command will be:
idf.py -p /dev/ttyACM1 flash monitor ?
And second question: must I use simultaneously two USB C cable connected to the board USB1 ans USB2 ?

[jwhui]

must I specify the USB2 port (anything like /dev/ttyACM1)

As stated in: https://openthread.io/codelabs/esp-openthread-hardware#2:

$ idf.py -p <your-local-port> build flash monitor

And second question: must I use simultaneously two USB C cable connected to the board USB1 ans USB2 ?

I just replied to your same question here: https://github.com/orgs/openthread/discussions/9994#discussioncomment-9011551

[mforbiz]

Hi jwui.
I've configured all system as your suggestions but during the flash I've this error:

Any idea?

[chshu]

@mforbiz If maybe caused by some USB connection issue. Could you please try the following steps:

1. build the example first: idf.py build
2. try to put the device into the downloading mode manually: hold the BOOT2 button, click the RESET2 button, then release the BOOT2 button
3. flash the firmware with this command:
   esptool.py -p /dev/ttyACM0 --no-stub -b 460800 --before default_reset --after hard_reset --chip esp32s3 write_flash --flash_mode dio --flash_size 4MB --flash_freq 80m 0x0 build/bootloader/bootloader.bin 0x8000 build/partition_table/partition-table.bin 0xf000 build/ota_data_initial.bin 0x20000 build/esp_ot_br.bin 0x340000 build/web_storage.bin 0x359000 build/rcp_fw.bin

[mforbiz]

Hi chshu.
It seems to works fine!
Many thanks