install windows server 2016 onto x3500 M5 with server guide --- no easy way with usb key drive --- but with double layer DVD+DL , it can be done

The update was:

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I tried to get some help from IBM /Lenovo regarding Windows 2016 installation using usb key ( server guide + windows media)

last year

and 

this year

they rekon I am after some info, and closed the cases

then I had to do it traditional way, burn serverguide dvd , burn DVD+DL for windows 2016

tried a couple of times. eventually installed windows 2016

but the current version uxspi not working inside windows 2016