Hi! I'm helping to manage a wordpress site. Recently, the site reverted to a 10 year old version of itself. I've updated the WP version and all plug-ins, and also deleted old themes. There was the new version of the site available at /wordpress-1, so I deleted that from the URL in the settings page, hoping it would replace the old version that the correct URL is currently pointing towards. Now, I can no longer get to the Dashboard – the only thing available is the old site. If I use /wp-admin or /login, it just redirects to the old site. Any idea what's going on? Or how to fix this? It seems like the current version of the site has been totally deleted?? Thanks!

Did you clear the server cache (at the root level) and delete your browser history?
It sounds like a URL or database configuration issue. First, check your WordPress wp-config.php file to ensure the WP_HOME and WP_SITEURL constants point to the correct URL. If these are not set, you might need to add them:
define(‘WP_HOME’, ‘http://yourdomain.com’);
define(‘WP_SITEURL’, ‘http://yourdomain.com’);
Next, access your site’s database through a tool like phpMyAdmin and check the wp_options table. Look for the siteurl and home entries and ensure they are correct.
If you have a backup, try restoring it to revert any unintended changes.
You can also use FTP to access your WordPress files and temporarily rename the plugins folder to disable them. This can help if a plugin is causing the redirect issue.
Finally, check the .htaccess file in your WordPress root directory for any incorrect redirects or rules that might be causing issues.
If these steps don’t work, consider reaching out to your hosting provider for support, as they might be able to restore a recent backup or provide additional assistance.