jailbreaking from an old ATV 2 with original 4.1.1 firmware


I just discovered that I have an ATV 2 that was never used and with 4.1.1 firmware. I looked on the web to see how to jailbreak it but it seems that since no SHSH signature was ever saved and Apple has moved on, seasOnPass did not work. I could not save the existing signature using tinyumbrella either. Then I restored it using iTunes, which moved it up to 4.2.1. It still did not help with seasOnPass. Any help will be appreciated.