One of my customers reported me an error on its website. we loaded a backup because it is a production site, however, since then, we no longer have access to wp-admin. The message I get when I go to /wp-admin is a 403 error, with a redirect to upgrade.php?_wp_http_referer=%2Fwp-admin%2F
The full error is the fullowing :
Access forbidden! You do not have the right to access the requested object. Either it is protected or it cannot be read by the server.
If you believe this is a server error, please contact the webmaster.
Error 403 Apache
I already tried to change the db_version in the version.php file and in my database, it didn't worked.