Update of fairphone 2 without wifi

Reboot to bootloader/fastboot (adb reboot bootloader)
Download boot.img https://dl.dropboxusercontent.com/u/56653875/boot-v4.img.tar.xz
Flash boot.img (sudo fastboot flash boot boot.img)
Hold power + vol up and run "sudo fastboot reboot"
Then run:
adb shell "mount -a"
sudo ubuntu-device-flash --server=http://system-image.ubports.com touch --channel=ubuntu-touch/devel_rc-proposed