Log into the board through ssh or console, then install RPMs with smart:
dnf install http://iot.bzh/download/public/2017/Chromium/latest/aarch64/chromium-ozone-wayland-<VERSION>.aarch64.rpm http://iot.bzh/download/public/2017/Chromium/latest/noarch/hicolor-icon-theme-<VERSION>.aarch64.rpm
Run:
dnf remove chromium-ozone-wayland hicolor-icon-theme
Remove, then reinstall:
dnf remove ...
...
dnf install ...
...