@paulo-presa-evangelista unless you are changing recalbox.conf in share_init (you shouldn't) you have an install and/or sd problem. try reinstalling and use another sd card if the problem is still there
,@Paulo-Presa-Evangelista
Try to install Filezilla and you will be able to read the fullsd card via sftp and modify your share section by uploading, downloading files,. I did it my way (Sinatra) 😉