roomescaper on "wp-admin 500 error"

Hi, i've recently updated my Wordpress to 4.4.

While updating everything was just fine but on the last (i guess) task of the core update thing, it gave 500 error. (I've seen it wrote deleting maintanence file)

After that i can't login to any wp-admin related page. It's giving 500 error.

I've tried the solutions with php.ini to wp-admin folder or updating the .htaccess file with AddType ... and they're not working.

Thanks in advance for your guidance.