Enter DFU mode on Lion (ATV2 4.3)

Hi,

I’m trying to jailbreak ATV2 4.3 8F455 using Lion. I could not manage to enter DFU mode. when I connect ATV it shows up in iTunes, I tried to press menu + play for 7 seven seconds several time with no luck.

 

Any help guys?

There are a few DFU mode related tips here.

Thank you James, seems something wrong with Lion. I managed to enter DFU mode on windows easily. but I have another issue now. Everytime I try to jailbreak I get an error message during restore process: The Apple TV could not be restored. An unknown error occured (21)

any idea about this error?