Help with WAAS on EM-411 (similar to EM-406A)

I can’t seem to be able to get WAAS enabled on my GPS. I’ve tried SIRFDemo and some others with no luck. It appeared to be enabled once but once the power was removed it reverted back to being disabled.

What is the secret? I live in the USA so I think it should work.

Has anyone been successful enabling this GPS? Any help would be greatly appreciated!