Quick question: Upgrading / re-jailbreaking an older AppleTv 2?

I have an AppleTV that is already jailbreaked and is running ATV. But since the OS is now too old in version, Netflix does not work anymore. So: I want to upgrade.

But what should I do:
Can I just download the newest version of SeasonPass and go on with it? Will it then get to the newest jailbreaked version?
Or do I need to do some firmware upgrade stuff beforehand - OR even use of of those older versions of the SeasonPass that matches my current version of the AppleTv OS??