Computer: MBP 15 Late 2013.
I have a BIOS booting Windows 10 installed on an external SSD. Windows occupies two partition on this SSD. The first is the System partition and the second is a combined Windows and Recovery partition. Below is the output from the command
Since I updated to Big Sur, I can not boot Windows from the external SSD anymore. I get a message that there is no bootable device and the computer restarts booting into macOS on the internal drive. It looks like Apple updated the boot loader (I can not tell from the new graphics), which appears to be connected to the issue. I have tried pretty much everything at this point and the only thing that lets me boot from the SSD is if I completely wipe/format the internal drive.
Is there a way to disable the internal boot drive so the boot loader doesn't see it? (I know this is a work around, but I don't have the time right now to further investigate the issue with the external SSD and why it can't boot from it.)