Not possible to upgrade from 5.0.2 to 5.2? (ATV2)

Is it not possible to upgrade an ATV2 running 5.0.2 to verion 5.2? I’m trying to figure out a way to do this so I can avoid having to do the tethered boot song and dance, but I know it may not be possible.

I’ve tried TinyUmbrella but I get an error 11 when I try to restore the ATV2 using the 5.2 ipsw.

Anyone/

It’s not possible without saved blobs for version 5.2

But why not do an untethered jailbreak on 5.0.2?

I’m running 5.0.2 right. It’s pretty unstable with the Plex client and I want to switch to PlexConnect which runs better on 5.2. Guess I may need to do the tethered boot. Thanks!