root the P8Max

Hi

I have managed to unlock the phone but I can't root it I have followed all the instructions and just no luck.

I followed this one http://forum.xda-developers.com/show...15&postcount=8

I get stuck at step 4, when I type in the command prompt "fastboot flash recovery recovery.img" is says waiting for device and just sits there and never changes, its like the phone is not connected.

Please if anyone can help me that would be great.