Question M.2 SSD not detected in BIOS (MSI B550M PRO-Wifi) ?

Jun 15, 2021
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Hey all,
after performing some much needed upgrades to my computer, including a new motherboard and CPU, my M.2 SSD is not being detected in MSI's BIOS. This is the drive with all my data on it, including my OS (Manjaro Linux) and it's impossible to boot from it like this.
Any help is appreciated.

Further information:

My motherboard is the MSI B550M PRO-Wifi
My CPU is the AMD Ryzen 7 5800X
The M.2 SSD is an ADATA XPG SX8200PNP (1TB)

The M.2 SSD is in the M.2_1 slot on my motherboard (although I have tried both slots)
My motherboard is in CSM mode
The PCI_E1 lanes are set to x4+x4+x4+x4
 

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