Help with error 1600 in Itunes

I just scored an ATV2 running 5.1, I followed the instruction to jailbreak it and i keep getting unknow error 1600. 

Now, the ATV2 will not boot up, just a blank screen and when I try to Jail break it with Seas0npass i get an error that ATV is not supported. 

Can someone PLEASE Help me…

I was able to save the firmware.