Some SSL certificates have two certification paths. In other words: the trust-chain can take two paths. I installed all the certificates for one path but that gave an HTTPS error on some older devices. I looked up how this can occur. I found out that some older Android versions can't follow the link to the other certificate that was included in the certificate. That I fixed.
My real question is this: How is it determined which certification path is chosen by a application? What is the logic behind this?