You should renamed back the plugin to what is should be. You should not clean the .htaccess, do you still have the copy of it which have been altered by Better WP Security? If no, things will be different.
You restored the backup, it means now the database is not matching with your files (.htaccess, plugin files, etc) so everything become complicated. Why? Because what you should restore are database and files. I don't know why this plugin only suggest users to backup database.
You issue was very simple, by default (if you press the "secure from basic attacks") it will change your login url to .../login. But now things become very difficult.
- Do you have a complete backup? Both files and database? You may restored your website but what you need are the complete backup.
- Do you have a copy of the .htaccess file which just altered by the plugin (after installation)?