wp-login.php Redirect loop…nothing works :(

Hi everyone,

since the latest update i’m suffering from the wp-login.php redirect bug. I can’t access my dashboard anymore.
I tried everything I could find on this topic:
-Disabling all plugins via ftp
-Disabling all themes via ftp
-Deleting .htaccess
-Adding every line of code I could find

Nothing works! I always get redirected!! I really don’t know what to do…
My site uses Woocommerce, I have customers waiting on their orders and I can’t access my site. Does anyone have an idea how I could fix this? I can’t loose all my data, so I don’t know if reinstalling WP is an option?

Thanks already!