Samuel, you got it right ! I just forgot to copy the wp-settings.php file.
Now everything is fine !
Thx
Copying the new files through FTP
Interesting, since I also updated wordpress using the manual method.
Up to now, i didn’t find how to fix it.
Since my web hosting has a backup function, i just restored a backup of the site to cancel the update.
I will wait for a fix or a workaroung before updating to 3.9
