Installation fails from pc to aTV2

Hi all,

I bought aTV Flash and jailbreaked my atv2 with this tutorial: http://www.appletvhacks.net/2012/05/14/how-to-jailbreak-apple-tv-2-5-0-1-ios-5-1-1-with-seas0npass-tethered/

The jailbreak went perfect but the aTV Flash installer stops and tells me that the installation is failed (error: 9.100). It can see my ip address.

Can you help me?