mac wont boot from m.2 after install

Hi everyone! I installed macOS Sonoma on an HP Z420 in December 2023. Unfortunately, my main SSD stopped booting after a GPU driver update for my GTX 710.

I then spent a week trying to get macOS working on an HP Z440, but no matter what I did, the system wouldn't recognize any drives. Frustrated, I went back to my Z420.

Here's the current issue: I have a PCIe NVMe to M.2 adapter. While macOS sees the drive externally, it doesn't show up as an internal boot option. I've followed various...

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