I have downloaded and installed a trial version of Boot Runner. I have a 2012 iMac. I have followed this website: Install Windows 10 on Mac using an external SSD [Video] - 9to5Mac and my setup is as follows:
External SSD #1 = Mac OSX Catalina
External SSD #2 = Bootcamp Windows 10
Internal 1TB SSD = Blank, exFat format to be accessible / used by both Mac OSX & Windows 10
When I reboot the iMac, BootRunner only shows the MacOS X SSD to boot from. The SSDs are in external USB3 enclosures.
How do I get it to show or pick up the Bootcamp Windows 10 installation on the second external SSD?