Hi,
In wamp/alias/phpmyadmin.conf file, juts before </Directory> add lines under to obtain:
php_admin_value upload_max_filesize 512M
php_admin_value post_max_size 512M
php_admin_value max_execution_time 720
php_admin_value max_input_time 720
</Directory>
I never tried with SQL file 500 Mib, but with a 320 Mib file, it works. Beware, it can be very long. If necessary,
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