"ERROR: Failed to load nf_conntrack module: modprobe: ERROR: could not find module by name='nf_conntrack'..." was exactly the error I had after the upgrade to firewalld-0.6.3-2.el7_7.1.noarch.
You should check if the downgrade worked:
# rpm -qa | grep ^firewalld- firewalld-filesystem-0.5.3-5.el7.noarch firewalld-0.5.3-5.el7.noarch
https://github.com/firewalld/firewalld/issues/519
cat /etc/os-release uname -a /sbin/modinfo nf_conntrack | head -1
https://forums.centos.org/viewtopic.php?t=72215
https://serverfault.com/questions/985302/firwalld-on-vps-without-nf-conntrack-kernel-module
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