during the upgrade pihole create a self-signed cert. TLS/SSL - Pi-hole documentation. Instruction on how to use your own is at the bottom. You have to make a few changes. This is how I did mine Own TLS certificate not used - Help - Pi-hole Userspace
during the upgrade pihole create a self-signed cert. TLS/SSL - Pi-hole documentation. Instruction on how to use your own is at the bottom. You have to make a few changes. This is how I did mine Own TLS certificate not used - Help - Pi-hole Userspace