WordPress Speed Up Service | WordPress Website Maintenance Packages Reply To: wordpress admin redirected to wp-admin/upgrade.php?, by Mateus Getulio Vieira Hello Dora. This issue could been cause because one of the following: 1- Apparently the WordPress is trying to finish the update but it can’t access the upgrade.php file. In this case try to check if the file is there or if it is corrupted, then try to replace it for a new functional file. 2- A plugin or your main theme could have been causing a conflict. In this case try to rename the plugins folder and/or or main theme folder in wp-content. Reply To: wordpress admin redirected to wp-admin/upgrade.php?