Have you tried downloading the latest firmware to /tmp/ on the Omega and doing a sysupgrade /tmp/<firmware-image> manually?
If your Omega has network, you can pull the firmware from an ssh shell and perform the upgrade.
If your Omega doesn't have upstream connectivity, you can scp (or pscp on windows) the firwmare image downloaded to your workstation/laptop over to the Omega to perform a manual upgrade.
