I recently installed Windows To Go onto my SD card, which is working fine (when e.g. booting from it using a SD-USB-adapter). Unfortunately my Notebook (Medion Akoya E4253) is not able to boot from it when it's inserted in it's native SD-card slot. When I connect it by an SD-USB-Card adapter everything words just fine.
The problem already occurs when I'm trying to boot from it by my UEFI, because it does not find any bootable SD medium (also tried with Linux on SD, etc). With the adapter, it works.
When I run
update-grub it recognizes the SD card and it's bootable content and it adds Windows to the boot menu. But when I try to boot from it, this error occurs:
error: no such device: abc-xyz error: file '/efi/Microsoft/Boot/bootmgfw.efi' not found.
Is there anything I can do so that GRUB will recognize the SD card, or is this due to the UEFI not recognizing it? The UEFI unfortunately does not have any option to fix this. Thanks in advance!