Missing installation guide for R+F Thermostat "unknown model name"

Hi everyone,

I have recently received my tado kits for my new appartment and am excited to set them up. Unfortunately, I am stuck in the installation process, since no guide is available for the current thermostats installed, even though I found them in the app:

I sent the support request twice but have not heard back yet. Does anyone have experience with these R+F thermostats and how to remove and then wire the tado thermostat?

I appreciate any advice! Thanks in advance!