Please run the commands below in your terminal in order to fix the screen flickering issue. You can copy and paste or type them out.

To implement the patch, open the terminal and run these commands:

   sudo sed -i 's/.*hdmi_group.*/hdmi_group=2/g' /boot/config.txt
   sudo sed -i 's/.*hdmi_mode.*/hdmi_mode=86/g' /boot/config.txt