How to reverse a Dell update?

Dell forced 6 updates on my Dell XPS 13 9350 today. My notebook is connected to 'everything' (including a 4K and a WHQD monitor) via the plugable USB-C docking station. During the installation, the second monitor (the WHQD monitor) went blank. Restarting the Dell notebook to complete the installation process did not help. After 3 restarts and unplugging the monitors from the plugable USB-C docking station (and shutting off everything, taking the electricity off every single piece of electronics), the second monitor still doesn't come on. If I unplug the 4K monitor from the docking station, the blank WHQD monitor starts up (works properly). The moment I plug the 4K monitor back into the docking station, the WHQD monitor goes out again. This is very annoying because I need to use both monitors simultaneously. How do I reverse the 6 Dell updates? [Dell has been nothing but *** about using two external monitors. Its own TB16 docking station didn't do what it was supposed to do and I had to trash it. Days of work, and now Dell destroyed a functioning setup...]