Installing Nuki on Urmet 1172/55 Signo

I’m trying to install Nuki on Urmet 1172/55 Signo, but in order to access the port L1 and L2 as the Nuki installation instructions asks me to do, I will have to unscrew two screws which seems to be extremely tight. Any ideas on how to loosen the screws without breaking the Urmet?