I’m a bit of a novice when it comes to jailbreaking, so bear with me. I jail broke my ATV2 a year or so ago, and the only jailbreak was tethered. I’ve been using it like that, but am getting a bit tired of having to reconnect it to my computer whenever the power goes out. I’m just wondering what I need to do to change to an untethered jailbreak. Currently the firmware on my ATV is 5.0(4099), and I used seasonpass to jailbreak. Any info is appreciated.
You can only go to a release for which you already have shsh blobs for your ATV2, or that Apple is still signing (currently 5.3). The 5.3 release is tethered, but you might decide to update to it get new features even though it is still tethered.
If you have ATV Flash installed you may find that you have shsh blobs for more than the currently installed firmware - you can check under the backup section of the Maintenance app by selecting the option to backup firmware signatures… The list of firmware releases and the jailbreak type is available at http://forum.firecore.com/topic/3418.