I just got an HP EX900 Plus. Both my motherboard (Gigabyte B450M DS3H) and Windows seem to detect it properly.

I used the “migrate OS” function in MiniTool Partition Manager, like many online tutorials suggested and it seems to have copied everything successfully.

But when I change the boot priority in BIOS to use the HP drive first instead of the old SATA one, or try to boot into it directly from the boot menu, it still boots from the old drive.

I tried unplugging all the other drives except the NVMe one, but then it just gives me a Windows error screen that says “missing bootable files” or something along those lines.

MiniTool still says my old drive is the boot drive and I’m not sure what to do.

All the search results suggest changing the boot priority in BIOS, but I already did that to no avail.

I can’t find this issue mentioned anywhere. The online tutorial that I followed showed that the drive was able to boot after MiniTool finished its thing with no extra steps required.