Debian Jessie fails for CuBox

I have been trying to apt update to the latest updates and I get this error. Any thoughts on how to fix, likely by updating certs? Note: I removed the H-t-t-p-s from the below because it thinks I’m putting links in this post.

Err repo.solid-build.xyz ./ Sources
server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates .crt CRLfile: none
Err repo.solid-build.xyz ./ Packages
server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates .crt CRLfile: none
W: Failed to fetch /repo.solid-build.xyz/debian/jessie/bsp-imx6/./Sources server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates .crt CRLfile: none

W: Failed to fetch repo.solid-build.xyz/debian/jessie/bsp-imx6/./Package s server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificate s.crt CRLfile: none

E: Some index files failed to download. They have been ignored, or old ones used