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After updating Fedora23 to 24 my Windows/UEFI does not start.

I successfully updated my Fedora 23 to version 24. However, the Windows (UEFI dual boot) system, which did work before, does not boot anymore: although the grub menu appears, only a black screen appears when Windows is selected.

In your documentation I noticed that this is already a known bug. It suggest to use the UEFI boot menu and/or to downgrade grub. With the first of these options, I can successfully start windows again. Now I'd like to downgrade grub as suggested to grub2-2.02-0.25.fc23 (grub2 from Fedora 23). I already tried various thinks such as "dnf install grub2-2.02-0.25.fc23" or "dnf downgrade grub2-2.02-0.25.fc23" but unfortunately nothing works. I'm new to dnf so please forgive my stupidity. What exactly needs to be done to get a working version of grub again? Many thanks in advance.