hi ,same issue here,
i try this you mentioned.
but still not work in File manager, most of other service is still work but phpmydmin also show errors like this:
phpMyAdmin - Error
Existing configuration file (/etc/phpmyadmin/config.inc.php) is not readable.
and also occurs another issue
i use this to fix the db download issue.
sed -i ‘s/$output[1]/$output[0]/’ /usr/local/hestia/web/download/database/index.php