Source In my case there were three matters preventing the drive from being detected: The BIOS version was too old The socket was not set to be recognised as a PCIe device (this requires a beta BIOS version) The drive was seated in the M2_1 socket instead of the M2_2 socket. The ASU| Ian's notes
[2025/02/21 – Additional TB5 JHL9480 models] IntroductionFastest external M.2 SSD enclosuresThunderbolt 5 JHL9480 enclosuresUSB4 ASM2464PD SSD enclosuresRetail modelsODM modelsThunderbolt 3 J…| Dan S. Charlton