Installed without a hitch using FlashTool via Ubuntu Linux 14.04. Some subtle terminology change I'm noticing with mobile networks ("4G" with this firmware vs the "LTE" used with the Latin Am. 6603 firmware). I have a 6653, so this firmware is more appropriate for me. Thanks to whoever uploaded this firmware!

Xperia Z5_E6653_32.0.A.6.200_Nordic_Generic 5.1.1
Sony Xperia Z5 (E6653) Android 5.1.1 firmware - Generic Nordic