I have one Catalina on an iMac 2019, with Boot Runner installed, and another Catalina on a Samsung T7 SSD external drive. I can get Boot Runner to only recognise both of them but when I select the volume on the T7, it only boots back to the volume on iMac not on T7. Please help.
“Blessing” the volume on extern SSD does work. It is just the same as selecting the external SSD as the startup disk which defeats the purpose of having Boot Runner.