Sorry…
if it starts with something like this:
-----BEGIN CERTIFICATE-----
MIIGEzCCA/ugAwIBAgIUTO8FMM6dA8s10nBgccb1cdOzjeMwDQYJKoZIhvcNAQEN
and not some binary characters, it should be base64 (or PEM). (As I wrote - the commands You used should have done this, it’s just to be completely sure.)