When trying to import a dump file from AIO WP Migration by Servmask, in some servers, the import stales at the import progress bar not updating forever.
This is usually related to an error 403.
Most of the times, it is a problem at the server side.
If you are using Cloudflare with the domain, you may benefit from whitelisting the server’s IP address and also your IP address in use, either your unfiltered IP address or VPN IP address.
This can be done under Security > WAF > Tools.
But going back to the server side of things, you can try temporarily turning off ModSecurity while the import happens.
Remember to turn ModSecurity back on after the import is complete.
Last but not least, in very very rare cases it could be a permissions issue in the file. This can happen on the system you are using, after the file is downloaded it could be stored with read-only permissions. Ensure to set the file permissions to something workable like 755.