So when I saw that I started by flashing a NodeMCU with basic and started programming.
However when I made a small program and saved it, I got no reaction from the3 editor.
So when I re-loaded the program I could not find my file back.
Not with the filemananger and not in the edit mode.
Then I switched from my Android Phone to a tablet which had a different version of Android installed and voila everything worked flawlessly........
So the solution:
I installed Firefox on both my phone and my tablet (for consistancy) and all my troubles were gone.
Now up to the first projects !!!
Luc