R650 unleashed

[JA1]

I run a network of r350 using unleashed. I have an r659 that has been running in an office environment without unleashed and wish to add it to the network 

I have successfully added unleashed firmware to the r350s before but cannot seem to do it with the r650

i do not have a power cable for the 650 . Do I need one to run the configure  set up or is there another way to power the 650 via poe to allow me to update the firmware 

thanks