OK, now I totally understand where the blocking is:

"VWMare"

I use vmware images for all dev stuff, it's more neat when I work between different computers. however, I did not realise that vmware add an intermedia traitment between usb device and guest OS, I thought it was connected directly.

So solution is simple, I have to compile my codes under Windows (win10 x64) or Linux (Ubuntu 16.0.4), both work well, but never under vmware.

@dimi
Thanks for Dimi, I did not read the Lesson 1 before.

I just follow all steps for the lesson, under windows 7, with driver 5.40.24, using Arduino1.8.5 downloaded directly from m5stack.com, I can total compil the example code "hello world", but always rejected during flashing.

Is there any possibility that my M5Stack has material default?

@dimi 在 Upload time out 中说：

5.40.24.

Hi dimi, thank you for your reply, could you please tell me where to get the driver version 5.40.24? I can not find it in the silabs homepage.

Thanks Dimi!
Just a little remark: I can not see any figure of this lesson, Could you please check it?

I have the same problem.
a brand new M5STACK core, with Arduino1.8.5 + library M5Stack from github + driver Linux_3.x.x_4.x.x_VCP from silabs.com, I got error message:

Archiving built core (caching) in: /tmp/arduino_cache_375208/core/core_espressif_esp32_esp32_FlashMode_qio,FlashFreq_80,FlashSize_4M,UploadSpeed_921600,DebugLevel_none_41c73171d0dd7eab7864b998a89c78d5.a
Sketch uses 135724 bytes (10%) of program storage space. Maximum is 1310720 bytes.
Global variables use 10592 bytes (3%) of dynamic memory, leaving 284320 bytes for local variables. Maximum is 294912 bytes.
esptool.py v2.1
Connecting.....................................................

A fatal error occurred: Failed to connect to ESP32: Timed out waiting for packet header
A fatal error occurred: Failed to connect to ESP32: Timed out waiting for packet header

I'm total lost.

Dev under Debian9 x64.