Had gpu issues which led me to flash bios and my nvme raid 0 disappearing. This has been a collective 20 hour nightmare thus far. The drives are in bios, the array is online and normal, but windows boot manager will not show its ugly head. ANY advice would be greatly appreciated

@exodusz - which version BIOS is previous and which is the new one you used?

Sounds like you don't have the same settings you used before (maybe different RST choices made before/now). First, start by loading optimized defaults. Then, reboot back to the BIOS and enable RAID.
If you are using Secure Boot, make sure you set this again, if you didn't use it before, don't set it now. Once I have both BIOS I can check for you to make sure RST modules are the same now as before, I mean if previous had both legacy and UEFI modules and if current one has both or only one type etc

It could also be a BIOS issue, bug etc, try flashing back to old BIOS again and see if you can easily get it all back to how you had it. If you can, then this may be the more likely issue