admin page not working

Dear Staff,
i have a big problem.
I installed protect-wp-admin some weeks ago and all worked well.
Some days ago something happened without any action on my side.
I was on holiday… and when i came back was not possible to login to the admin panel. I tried to login to /my-admin-dir or to /wp-admin but nothing happenned.

Then, i had a look on .htaccess and was completely clean like this:

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ – [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

# END WordPress

So, i took another .htaccess from another wordpress with same modules and pasted in root dir.

Finally, after this change the login page appear again, but when i login with username and password, every page of the admin is completely white and by looking to the source code there is completely nothing.

I changed the directory name of the module but nothing to do… Is it possible that an automatic update created this big problem? Till now I’m not able to access wp-admin and for sure i disabled the module also on the other wp i have.

So, please help me, otherwise i have a really big problem!
Regards

https://ww.wp.xz.cn/plugins/protect-wp-admin/