So far I have upgraded ROME systems in Virt-Manager (Qemu) and VBox. These are both Plasma6 Wayland x86_64 systems. YMMV. (X11 does not work for me in Qemu or VBox.) This basic command string works just fine.
sudo dnf clean all ; sudo dnf dsync --allowerasing
All few oddities.
During the upgrade windows pop up for 2 things. There is a new KDE Welcome thingy. For that one just click skip or ignore it. Another window pops up saying “Updating” that is for Discover. You can click cancel or just ignore it.
In VBox the new kernel does not boot for me. So to upgrade ROME system in VBox I recommend for now to do:
sudo dnf clean all ; sudo dnf dsync --allowerasing -x kernel-desktop
Edit: To make this permenant so you do not accidently install it add this line to your /etc/dnf/dnf.conf:
exclude=kernel-desktop-6.19.0-1
Note: kernel-desktop-6.19.0-1 does work for me in both Virt-Manager(Qemu) and works in hardware in my Cooker hardware systems. So should be fine on hw systems.
If you want a new kernel 6.18.9-2 from here is working for me. Don’t worry that it says cooker and not rolling. All kernels originate in cooker.
So far not to much excitement except the kernel not working in VBox, that is reported to developers.
On to upgrading my hardware ROME system. Will report when done.