Trying to Jailbreak - but dont want upgrade to 4.3...

I bought another apple tv - and it has the old 4.2.2 firmware… I want to jailbrake but it wants to download the new firmware… which I dont want  - as PLEX doesn’t work well on 4.3…

I tried to select the old firmware in the prefernces… however it keeps downloading 4.3…

anyway to use Seasonpass to Jailbreak an Old Firmware? and not upgrade?