Hey Bruce,
There are two ways to load your yum certificate:
1) The 128T installer will prompt you to paste in your certificate if one isn't already present. (or ask if you want to overwrite the current cert)
2) You can copy the certificate file to `/etc/pki/128technology/release.pem` However if this is a fresh system you will need to create the `/etc/pki/128technology` directory as well.
sudo mkdir -p /etc/pki/128technology
¾
<copy your certificate>
¾
[t128@router 128technology]$ ls -al
total 8
drwxr-xr-x 2 root root 25 Mar 7 07:27 .
drwxr-xr-x. 11 root root 137 Jan 30 10:03 ..
-rwxr--r-- 1 root root 5576 Mar 7 07:27 release.pem