Network Recovery Mac Mini mid-2011

Hi,

I'm trying to use the Network Recovery to my mac mini mid-2011 running in OS X Lion 10.7.5 but it seems to dont work at all. I tried to install the EFI Firmware Update 1.6 but it seems that i don't need it ( the system told me so... ).

The globe is blinking for 10 to 15 seconds and then he apple comes and start directly from the disk. In the Startup manager i don't see at all anything in the network. I configured the DHCP option as required well ( my Windows comp is running fine so i can confirm it work through network ) but still no succes.

Am i missing something ?