Question M.2 not working

[sjdhq816]

Hey guys.
This isn't actually my own board, but someone asked me to help him. He has an ECS B250H4-M20 mobo. But, the mobo does not recognize M.2 at all. It does detect SATA SSDs and hard drives. So I tried updating the BIOS which didn't work, then I tried getting 2 different motherboards of the same model. They all had the same problem. I googled and found that this might be because the mobo does not have UEFI mode enabled. So, I went into the BIOS and I don't know if this was the correct setting, but there was an option like "UEFI boot mode" and it was already enabled, We tried other m.2 SSDs, but no result. Is there something we can do or is the motherboard faulty itself?

 

[alceryes]

Please list the exact model of M.2 drives you have tried.
Does this board actually support NVMe or is it only SATA? I'm finding conflicting/obtuse wording regarding what it supports.

 

[sjdhq816]

Please list the exact model of M.2 drives you have tried.
Does this board actually support NVMe or is it only SATA? I'm finding conflicting/obtuse wording regarding what it supports.

I remember trying WD Green 250GB. I don't think it's an nvme drive. But this same ssd runs fine in a B150 mobo from ECS. Which is an even older motherboard.