I installed a plugin called Hide My WP to change the site structure, but given that I was using a custom theme, it broke some of the features. So I manually deleted the plugin from the plugins folder, but since then I haven't been able to access /wp-admin/, which redirects to a 404 error.
I've tried every fix I read, from changing file permissions according to "Hardening Wordpress", resetting .htaccess, reuploading the /wp-admin/ folder & wp-login.php, defining SSL only on wp-config.php as well as the wp_options table on the database, but the error persists. I still can't login.
wp-login.php has a redirect loop, which might be caused by a forced SSL feature that the plugin originally enabled. Is there any way to reset this, without having to create it all over again?