about 404 error

Hi there, 

This is an emergency case and needs your help asap.
Last night, I touched the header builder on the production site, and then The 404 error occurred.
I didn't change anything on the header builder and tried to fix it, so I refreshed the permalink's saved bottom, but it didn't work.
And also I revised the code of .htaccess through FTP.
I updated to the following code 

# 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

However, it didn't help as well.
I have no idea how to fix it.
Moreover, all permalink disappeared. I only can open the wordpress dashboad now.
Please advise me how to fix this.
Thank you,

Miki

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