Android fastboot waiting for devices

Question

I am trying to load a customized kernel on my NVIDIA test git. I typed fastboot boot myImage after which which I get:

 
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Answer 1

The shortest answer is first run the fastboot command (in my ubuntu case i.e. ./fastboot-linux oem unlock) (here i'm using ubuntu 12.04 and rooting nexus4) then power on your device in fastboot mode (in nexus 4 by pressing vol-down-key and power button)