Can 4.2.1 still be restored?

[airmax-b3]

My jailbroken ATV2 is not working properly. So I was thinking to restore original 4.2.1 fw and then jailbreak again.
I know from the iPhone that you can only install the latest firmware as Apple verifies the firmware that you are trying to install online. Is this also true for ATV? 4.3.0 is out – can I still restore to 4.2.1?

 

[F-six]

I don't think so. As soon as you hit the restore button it wil also upgrade to the latest version of the software.