I successfully intalled Beta 4 using the tethered boot process. I have one question: Can I power down the ATV and will it reboot itself or do I need to start over with the JB and reinstallation of ATV Flash?
The reason I ask is that I sometimes travel with my ATV using it to download movies and for use with my iPad and AirPlay.
The fact that it is a tethered boot means that it needs to be plugged into your PC/Mac running SeasonPass every time it is powered on or rebooted. In SeasonPass you select the Boot option which is much quicker than the original jailbreak. Hopefully the untethered Jailbreak for the latest iOS will soon be available to remove this restriction.