Z370 Not recognizing ssd as boot device

Original config that would boot



Current config in the photo, running z370 taichi.



I noticed that i mistakenly placed the 2tb drive in the A1 slot rather than sata3_4.

I wiped the 2tb, reconfigured for mbr, replaced a1 w sata3_4 and on next boot I lost my 500 and 2tb ssd's as boot options (in 3_0 and 3_4 respectively).

I tried swapping 3_0 with 3_2 to make the ssd visible, but the mobo still wouldn't recognize it as a boot device.

I've reseated my ram, checked that csm is enabled, not sure where else to go.

I can mash f11 and select my 500gb ssd as a boot device, but can't set the ssd as the default boot option

Any help is greatly appreciated.