Can't install Volumio :(

im trying to install Volumio on my Pi 2 with Hifiberry DAC +, but it seems inpossible. Im using Linux to flash Volumio on a 32GB SD (32GB FAT 32 Partition). I’m doing exactly what the instructions say, but when I connect the Pi to my FritzBox it detects a LAN device but can’t connect it to the network. Do you have any ideas to fix this?

Is dhcp enabled and is the port activated on the Fritzbox? There shouldn’t be anything on volumio blocking a connection.