I suspect the laptop has some strange configuration.
My recommendation is to find another computer or source as a TFTP server.
I think there is problem with windows. currently I'm using windows 10. A friend of mine suggest me to do the same process with windows 7.I will try tomorrow and let you know. otherwise I have check and verify every single possible method to copy, but all in vein..
An antivirus also could be the problem, try with other tftp software, I used 3cdaemon a time ago and it works as well.