Don't update to 5.1.1 if you want to have root an unlocked bootloader.
In the Version 5.1.1 Nokia / Foxconn locked the bootloader, so installing root by tethered recovery mode (like in 5.0.2) is not possible anymore....

I have:
Nokia N1 (Taiwan) with 5.0.2, Unlocked Bootloader, Root and Gapps
Nokia N1s (China) with 5.1.1, Locked Bootloader, No Root and No Gapps.

The HW of Nokia N1 is Intel Moorefiled Plattform (Like Jolla Tablet ?)
I ask me, if it would be possible to flash the Nokia N1 withj the Jolla Tablet Image with Intel Flash Tool
????