MSI Z77a-GD65 with Samsung Samsung PM 512GB M.2 SSD

I am very new at this… I have an nvme pci card installed, and a working Samsung SSD950 Pro connected to this nvme pci card.
It works vell, with both mbr and gpt partition.
I have tried to replace it with Samsung PM 512GB M.2 SSD, but my Bios will not recognice the ssd. Also tried with a fresh install. Windows 10, find ssd and install well, but will not boot on drive aftherword.
I have cloned a working gpt system, but still no Windows Boot manager avaiable in Bios.
Is this because of Bios limitation? Is it possible to add this mod to Bios?
Happy to hear from some of you experts i Bios Modding :slight_smile: