use M.2 NVMe ssd in old E7250

I have verified that 2230 M.ssd NVMe works in E7350 WWAN slot as a secondary drive.  it would not detect the ssd as a boot drive.  It can only boot from sata drive but once boot into Windows the m.2 ssd shows up.  I set it up as unallocated before, and I then create single volume in it to make it a D: drive.  note the WWAN PCIe bandwidth is definitely not 4 lane, more likely 1 or 2 lane at most.