Trying to jailbreak (2) G2 Apple TV's

I have (2) ATV’s, one running 5.1, and another running 5.1.1.  I tried to jailbreak both using Seas0nPass and get “This AppleTV is not eligible for this version” on both devices.  I’m relatively new to this, but I was under the understanding that if the device hadn’t been updated to 5.2.1 that I could still flash these.  Is that not the case?  What am I missing?  I tried to save the SHSH’s with TinaUmbrella too and it wouldn’t let me do that either.  Any help is appreciated!