LoPy4 problem to Run and Upload

[Laguit]

Hi !

First of all, I'm a beginner on Pycom's tech.
I buy a LoPy4 and a Expansion Board v3.0 recently and today I tried to make my first program on it.
I installed ATOM (v1.36.1) and Pymark (v1.4.13)
Pluged my Pycom board

And I update the Pycom board software as it written on the tutorial (v1.18.2.r3)
Then I tried a program (still on the tutorial)

BUT nothing changed when I click on RUN and when I tried to upload, I get this message :Upload failed: timeout. Please reboot your device manually.
The LoPy LED doesn't blink in any color

I don't know what the problem could be. The LoPy4 is connected and all is well powered (Proof : expansion board ==> USB led in green | RGB_LED fixed in red)

Thanks for your help !

Ben