There is no board that I can select. I tried to downgrade the arduino extension to v0.4.5 but it didn't work, i also tried to specified manually the board in .vscode/arduino.json but it didn't work either.
What else can I check or what settings might lead to an empty board selector?
Try to download the boards package:
Open the command palette (ctrl+shift+p
).
Enter arduino: board manager
and hit enter.
Find the package that suits your board, and click install. Wait for it to finish.
Now you can come back to the "Select Board" menu and select your board.