Although the Chronic Dev Team promised that the RC5 version of greenpois0n would allow Apple TV 2G users to jailbreak their devices, unfortunately the team did not have time to include support for this Apple product yet. Seas0npass is a jailbreak solution for Apple TV 2G and its developers promise that next week they will release a new version of the jailbreak program that will be compatible with iOS 4.2.1. The last time Chronic Dev Teama talked about greenpois0n RC6 said that it will come with support for Apple TV 2G, so next week it is very possible that we will have a new version of greenpois0n available.
The first beta version of Seas0nPass for Windows has gone out to those who signed up for the Seas0nPass beta earlier this week. Barring any major setbacks, or show-stopping bugs we're hoping to have a public version available next week.
I don't know if the new version of greenpois0n will bring anything else besides support for Apple TV 2G, but it would be interesting if it had a device activation system implemented.
UPDATED: greenpois0n RC6 is now available for download.
