Do you have any cache plugin installed? If yes, please disable all the cache plugins.
Then please try replacing all the old URLs with the new URLs with this plugin instead:
If it doesn't help, please add the following code under
wp-config.php file locates in the root directory:
If it still doesn't work, would you mind providing us with login credentials(by clicking on the Secure Note button at the bottom) so we can take a closer look? To do this, you can make a post with the following info:
- Link login to your site
- WordPress Admin username / password
- FTP credentials