New Sonoff RF Bridge Board - Need Flashing Help

Hi, I’m completely new to the Home Assistant community, so please forgive me in advance for my possibly simple and not so technically perfect questions. I want to integrate my existing radio-controlled sockets, devices and roller shutters to get started with Home Assistant. I bought a SONOFF RF Bridge R2 for this purpose (see photo). I was able to teach the SONOFF Box for the radio-controlled sockets and devices without FLASHing. Unfortunately, the roller shutters (Warema EWFS timer and Velux KLI 313 radio wall switch) are a bit of a nuisance. As I can’t quite understand the chat, I wanted to ask whether the solution mentioned here would be a solution and what the current status is. Which conductor tracks on the circuit board have to be cut and when, and which firmware or software has to be uploaded when and how? Many thanks in advance.